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Lunar Meteorite
Paired* stones Anoual and Northwest Africa
773, 2700, 2727, 2977, 3160, 3170, 3333, 6950, 7007, 8127, 10656, 10985,
11616, 11703, & 11767
northwestern
Africa
 
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*The reported find and purchase
locations of the NWA 773 clan of lunar meteorite stones are far too
dispersed for all the stones to be terrestrially paired, that is, all
fragments from a single fall. Anoual and Dchira are separated by 1160 km,
for example. Compositionally and mineralogically, these stones are clearly
all related and none like them have been found outside the area of this
map. So either we must accept the coincidence of launch
pairings - one impact on the Moon launched several stones that all happened
to land in Northwest Africa - or that some of the reported find locations
are inaccurate.
(Map courtesy of Google Earth.)
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Photo of a sawn face of Northwest
Africa 773. As with Dhofar 287, the
stone appears to be a portion of a regolith breccia that contains a large
clast of olivine gabbro and many small clasts.
(photo credit: Marvin Killgore; from
Fagan et al., 2003)
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A slice of NWA 2977, which, like NWA
773, is a olivine gabbro. Tick marks on the scale
are spaced at 1 mm intervals. Thanks to Mike Farmer for the sample.
(photo credit: Randy
Korotev)
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Sawn face of NWA 2727 showing three
lithologies: (1) basalt (right) and (2) breccia (left) containing (3) two
gabbro clasts including a very coarse-grained one.
(photo credit: Stan
Turecki and Tony Irving)
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NWA 2727, a breccia that is dominated
by mare basalt.
Tick marks on scale are spaced at
1-mm intervals.
(photo credit: Randy
Korotev)
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A slice of NWA 3160, which is mostly
basalt, with breccia along top and right edge.
(photo credit: Randy
Korotev)
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NWA 3170 consists subequally of
olivine gabbro and brecciated basalt.
(photo credit: Stefan
Ralew and Martin Altmann)
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A slice of NWA 3333, a breccia (lower
left of center), with a olivine gabbro clast
(left) and olivine-phyric basalt clast (right).
(photo credit: Randy
Korotev)
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False color x-ray map of the interior
portion of the NWA 3333 section above. Red represents aluminum, green,
magnesium, and blue, iron. In this scheme, red grains are plagioclase,
green are mostly olivine and some magnesian pyroxene, and purple to blue
colors are Fe-rich pyroxene, glass, and ilmenite. A glassy impact-melt vein
with several large vesicles cuts through the breccia
on the right side.
(photo credit: Katherine
Gibson)
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A large slice NWA 3170 showing the
breccia (middle top) and olivine gabbro (left, right, bottom. Click on
image for enlargement (big).
(photo credit: Randy
Korotev)
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NWA 6950
(photo credit: ?)
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NWA 7007
(photo credit: Greg
Hupé)
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A polished face of NWA 7007 (width =
~3 cm). Click on image for enlargement (big).
(photo credit: Randy Korotev)
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Two views of of NWA 8127. Click on
image for enlargement.
(photo credit: Peter Marmet)
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Sawn face of NWA 10656. Click on
image for enlargement.
(photo credit: Darryl Pitt)
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Sawn face of Northwest Africa 10985.
Click on image for enlargement.
(photo credit: Carl Agee)
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A different slice of NWA 10985. Click
on image for enlargement.
(photo credit: Randy Korotev)
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Sawn face of NWA 11616 showing at
least three different lithologies
(photo credit: Darryl Pitt)
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from The
Meteoritical Bulletin, No. 93, Meteoritics
& Planetary Science 43,
571–632 (2007)
Anoual
Anoual, Morocco
Find: 2006 May 3
Mass: 5.92 g
Achondrite (Lunar, mare basalt/gabbro
breccia)
History: Nomads from near Anoual (a village located
in the East of Morocco between Bouarfa and Talsint; about 40 km E-N-E of
the latter) learned that the small odd stones that had been found close to
their settlement in June and July of 2005 was indeed a meteorite from the
Moon (NWA 2727). After extensive searching and screening of the soil, Mr.
Boujena recovered 12 pieces for a total mass of 5.92 g, over a small area
of about 5 m in diameter. The small size of the pieces can be explained by
the brecciated character of the stone. Ph. Thomas visited the place in May
2006 and May 2007, participated in the search, took pictures, in particular
of the investigated soil and registered the GPS coordinates.
Physical characteristics: Tan greenish stones devoid of fusion
crust.
Petrography: (A. Jambon, O. Boudouma and D.
Badia. UPVI).
Breccia composed dominantly of two lithologies: A phyric basalt and a
gabbro. Basalt with subhedral olivine phenocrysts (<1mm; 20 vol%)
slightly resorbed in a finely crystallized groundmass. Highly fractured
gabbro clasts. Small doleritic clasts with zoned pyroxenes. Mafic areas of
once molten rock with olivine needles. One clast of quenched basaltic melt
with numerous zirconolite needles (0.7 vol%; 0.1 mm) silica and celsian
K-spar. Ilmenite, troilite, chromite. Plagioclase and clinopyroxene.
Carbonate fills the largest fractures.
Geochemistry: (EMPA) Olivine (Fa45-28,
with few crystals >Fa45; FeO/MnO = 97). Pyroxene: from (Mg#= 0.80)
pigeonite (Wo10) and augite (Wo45) to pyroxferroite
(Fs70Wo25; FeO/MnO = 70). Plagioclase (An91-83).
Spinel (Cr66Sp25Us3Mt6).
Classification: Lunar mare basalt/gabbro breccia.
Paired with NWA 2727/3160 (and potentially NWA 3333)
Type specimens: A total of 1.205 g of sample (one polished section) is on
deposit at UPVI.
Thomas
holds the main mass.
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from The
Meteoritical Bulletin, No. 85, Meteoritics
& Planetary Science 36,
A293–A322 (2001)
Northwest
Africa 773
Western Sahara
Found: 2000 September
Mass: 633 g
Lunar Meteorite (cumulate olivine
norite with regolith breccia)
[see discussion below regarding
classification]
Three stones of 359 g, 224 g and 50
g, totaling 633 g were sold to Marvin Killgore (SWML) by nomads who showed
him the place of find on a flat dry desert plain near Dchira,
Western Sahara.
Mineralogy and classification (T. Fagan, UHaw, M.
Killgore, SWML):
consists of two distinct lithologies, cumulate rock and regolith breccia;
weathering grade, W1; shock stage, S5. Cumulate portion: modes (vol%) are
olivine = 54.7, pigeonite = 24.2, augite = 5, feldspar (including minor
K-feldspar) = 15.6, opaques (troilite, chromite, Fe-metal) = 0.5; olivine,
Fa28-97, mean Fa31, FeO/MnO = 99±11 g/g; pigeonite,
En64Wo11, FeO/MnO = 53±6 g/g; augite, En49Wo36,
FeO/MnO = 46±6 g/g; plagioclase, An88-91; Ba-rich K-feldspar, An3Ab4Or93
with average BaO = 2.2 wt.%. Breccia portion: contains fragments of cumulate
portion as well as silica glass, hedenbergitic pyroxene, volcanic rocks,
and unusual lithic clasts with fayalite + Ba-rich K- feldspar + silica +
plagioclase; olivine and pyroxene in the breccia have a slightly wider
compositional range towards lower Mg/(Mg+Fe) than in the cumulate portion
of the rock.
Chemical composition (D. Mittlefehldt, JSC): KREEP-rich with strong
negative Eu-anomaly. Noble gases (O. Eugster, Physikalisches Institut,
Bern): high solar wind component, 4He/20Ne = 9,
indicative of regolith material.
Specimens: type specimen, 15 g, NHM; main mass SWML.
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from The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2700
Morocco
Find: 2004
Mass: 31.7 g
Achondrite (lunar, olivine gabbro
with regolith breccia)
History: A light green to dark complete stone
of 31.7 g was purchased in Erfoud, Morocco, in November 2004.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU) The
specimen consists of olivine gabbro and regolith breccia lithologies. The
cumulate olivine gabbro contains ~50 vol% olivine (Fa29.3-34.7;
FeO/MnO = 94), pigeonite (Fs22-28.3Wo5.6-10; FeO/MnO
= 52), augite (Fs13.2Wo38.5), plagioclase and minor
maskelynite (An89), Ba-rich alkali feldspar (Or92An4;
BaO = 8.9 wt%), Cr-spinel, ilmenite, phosphate, and troilite. The breccia
lithology is dominated by small olivine gabbro fragments and also contains
subvariolitic basalt clasts with zoned pyroxenes (Fs44Wo29
to Fs58Wo23; FeO/MnO = 57); plagioclase (An90);
ilmenite, and Fe-rich, low-Ca pyroxene (Fs80.8Wo14);
symplectites of fayalite (Fa91); hedenbergite (Fs60.3Wo32.7);
silica; clear to yellow glass spherules; agglutinates, high silica
fayalitic rocks (Fa95.6); ulvöspinel; K2O-rich glass
(K2O = 8.8; SiO2 = 77 [both wt%]), and pure SiO2.
Classification: Achondrite (lunar, olivine gabbro
with regolith breccia) where the olivine gabbro is moderately shocked and
minimally weathered. Note: This sample may be paired with NWA 773.
Specimens: A 6.8 g type specimen and two thin sections are on deposit at NAU. An
anonymous finder holds the main mass.
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from The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2727
Morocco or Algeria
Find: June/July 2005
Mass: 191.2 g
Achondrite (Lunar mare basalt/gabbro
breccia)
History: Four stones of 30.6 g, 11.6 g, 64 g
and 85 g were purchased from Moroccan dealers in Erfoud for a consortium of
North American collectors in June and July of 2005.
Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU; A.
Irving and S. Kuehner, UWS;
R. Korotev, WUSL)
All stones are very similar and consist of a clast-dominated polymict
breccias composed of >80 vol% olivine-phyric basalt and gabbroic/diabasic
clasts (0.2 cm to several cm across) within a finer breccia matrix. The
basalt clasts show a wide range in mineral compositions, but all contain
phenocrysts of olivine Fa 28-99 FeO/MnO = 98.9 and some also
have phenocrysts of pyroxferroite or chromite all in a rapidly quenched,
fine-grained matrix consisting of intergrown pigeonite, pyroxferroite,
K-Ba-feldspar, ilmenite, merrillite, baddeleyite, troilite, silica and
glass. The gabbroic clasts range in texture from coarser grained (>3 mm)
hypidiomorphic gabbro to finer grained (~1 mm) diabasic clasts. Both types
of gabbroic lithologies consist mainly of pigeonite Fs23.3-31.3Wo8.7-11.5,
FeO/MnO = 60-69 and subhedral to anhedral olivine Fa34.1-41
FeO/MnO = 85-99 with less abundant augite Fs24.1-47.5 Wo24.4-32.1
and partly maskelynitized, blocky to tabular plagioclase An81-94.
The breccia matrix consists mainly of gabbroic debris with fragments of
basalt, silica polymorph, symplectites, subparallel intergrowths of
anorthite + pyroxferroite+ilmenite and
shock-melted material.
Bulk compositions: (R. Korotev, WUSL) INAA
of 11 subsamples show that they vary considerably in bulk composition, with
the most Fe-rich subsample nearly indistinguishable from NWA 3160 basalt.
All other subsamples are compositionally equivalent to mixtures of NWA 3160
basalt and the regolith breccia lithology of NWA 773, but with slightly
lower concentrations of incompatible elements. Note: Based on petrography,
mineral compositions, and bulk compositions, these stones are paired with
NWA 3160 and may be paired with NWA 773.
Classification: Achondrite (lunar, mare
basalt/gabbro breccia).
Specimens: A 20.2 g type specimen and two polished thin sections are on
deposit at NAU.
A 0.5 g type specimen is on deposit at WUSL.
Oakes, Reed, Boswell, and Turecki hold the main masses.
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from The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2977
Morocco or Algeria
Find: 2005 November
Mass: 233 g
Achondrite (lunar, gabbro)
History: A single minimally weathered
fusion-encrusted stone of 233 g was purchased from a Moroccan dealer in
Tagounite, Morocco, by M. Farmer in November 2005.
Petrography and Geochemistry: (J. Wittke and T. Bunch, NAU; A.
Irving, UWS)
The specimen consists of a single yellow-green, relatively coarse-grained
rock traversed by thin, black glass-rich veins. It is an olivine-rich,
twopyroxene cumulate gabbro composed of olivine (Fa31.7; FeO/MnO
= 96; 52 vol%), (Fs26.6Wo6.7; 23 vol%), augite (Fs16.2Wo29;
9 vol%), and plagioclase (An56; 14 vol%) with minor amounts of
Ba-K feldspar, chromite, ilmenite, and merrillite. Larger pigeonite grains
commonly enclose equant olivine grains, which contain abundant melt
inclusions (0.025–0.125 mm). Plagioclase is partially converted to
maskelynite, and pyroxenes and olivine exhibit shock lamellae and
undulatory extinction. Note:
This specimen is identical in texture and mineral composition to the gabbro
clasts in NWA 773 and NWA 2700 and thus appears to be paired with those
breccia specimens.
Classification: Achondrite (lunar, gabbro); minimal
weathering.
Specimens: A 20.1 g type specimen and one polished thin section are on
deposit at NAU. A 0.5 g specimen
is on deposit at WUSL.
An anonymous owner holds the main mass.
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from The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 3160
Morocco
Find: 2005 July
Mass: 34 g
Achondrite (lunar mare basalt
breccia)
History: In July 2005, A. and G. Hupé
purchased three broken stones with a total weight of 34 g from a Moroccan
dealer in Erfoud, Morocco.
Physical Characteristics: The largest stone (28 g) has a
partial thin weathered fusion crust.
Petrography: (R. Zeigler and R. Korotev, WUSL; A.
Irving and S. Kuehner, UWS)
The large specimen consists almost entirely of a fine-grained,
olivine-phyric basalt clast with minor attached breccia matrix and appears
to be part of a larger, coarse-grained, polygenic breccia. The two small
stones are pieces of the breccia. The basalt contains phenocrysts of
euhedral to subhedral olivine (~0.1–0.9 mm) and minor chromite (<0.1
mm).
Geochemistry: Olivine phenocrysts are zoned, with
cores typically Fo55-70 and rims extending to ~Fo40;
FeO/MnO ratios are 91-105. The groundmass has spinifex olivine Fo29
and skeletal pyroxene En37-39Wo11-13 FeO/MnO = 71-75
set in a fine-grained matrix of pyroxene En35-39Wo20-23,
olivine ~Fo22 and glass. The breccia lithology is a fragmental
breccia consisting primarily of olivine Fo6-82 and pyroxene En1-68Wo9-39Fs16-83,
with minor amounts of plagioclase An82-97 and trace silica;
hedenbergite-fayalite-silica symplectite (after former pyroxferroite), and
Fe-Ti-Cr oxides.
Classification: Achondrite (lunar, mare basalt
breccia). Note: These samples may be paired with NWA 2727.
Specimens: A 4.8 g type specimen and one polished thin section are on
deposit at UWS.
A 2.1 g specimen is on deposit at WUSL.
A. Hupé holds the main mass.
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from The Meteoritical Bulletin, No.
101
Northwest
Africa 3170
(Northwest Africa)
Purchased:
2007 April
Mass: 60 g
Lunar meteorite (gabbro)
History: Purchased from a Moroccan dealer in
2007 by Stefan Ralew.
Physical characteristics: A single 60 g stone consisting of
large clasts of yellowish-green gabbro (containing fine, black shock
veinlets) in a darker fragmental matrix.
Petrography: (A. Irving and S. Kuehner, UWS)
Monomict breccia consisting of ferroan gabbro clasts and related debris.
Predominantly composed of olivine, clinopyroxenes and anorthite with
accessory fayalite, silica, ilmenite and minor K-Ba-feldspar. Symplectitic
intergrowths of hedenbergite+fayalite+silica are
present. No orthopyroxene found.
Geochemistry: Olivine (Fa29.6-39.9,
FeO/MnO = 82-116), pigeonite (Fs42.3Wo11.9, FeO/MnO =
79), subcalcic augite (Fs28.7Wo26.2, FeO/MnO = 57),
subcalcic ferroaugite (Fs64.4-78.8Wo26.3-26.2,
FeO/MnO = 78-93). Bulk composition (R. Korotev, WUSL): mean values from INAA
of subsamples are 20.7 wt.% FeO, 40 ppm Sc, 56 ppm Co, 110 ppm Ni, 24.3 ppm
La, 11.2 ppm Sm, 0.76 ppm Eu, 8.1 ppm Yb, 4.3 ppm Th.
Classification: Lunar (mare gabbro breccia). This
stone is very similar in mineralogy and bulk composition to NWA 7007, and
both specimens are likely paired with NWA 773.
Specimens: 12.1 g is on deposit at UWS.
The remaining material is held by Ralew.
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from The
Meteoritical Bulletin, No. 94, Meteoritics
& Planetary Science 43,
1551–1588 (2008)
Northwest
Africa 3333
Morocco
Purchased: 2005 May
Mass: 33 g
Achondrite (lunar basaltic fragmental
breccia)
History: Fabien Kuntz purchased a 33 g
specimen from a Moroccan dealer. The original main mass was broken into at
least 5 pieces and distributed to several dealers.
Physical characteristics: A partially weathered blackish brown
fusion crust was present on the specimen. Cut and polished surfaces on two
different specimens reveal a coarsely brecciated texture, while a third
specimen exhibits three different lithologies.
Petrography: (R. Zeigler, WUSL) The
specimen examined consists of one basalt clast (1.5 cm) and one clast of
cumulus olivine gabbro (1.2 cm) set in a fragmental breccia matrix. The
basalt consists of large phenocrysts of zoned olivine and smaller chromite
phenocrysts set in a fine-grained matrix of spinifex olivine, skeletal
pyroxene, and glass. The olivine gabbro is 50% olivine, 35% pyroxene, and
15% plagioclase. A vein of black shock melt separates the cumulate clast
from the fragmental breccia. The breccia is composed predominantly of
pyroxene and olivine clasts, with minor plagioclase, and trace silica,
Fe,Ti,Cr oxides, troilite, chromite, ilmenite, FeNi, apatite, and
RE-merrillite.
Mineral compositions and
geochemistry:
Matrix pyroxene and olivine is Fs17-65Wo12-29En8–61
and Fo5-60; plagioclase clasts are An86-95Or<2.
Olivine in the basalt is zoned (Fo47-72). Mineral compositions
in the olivine cumulate are Fo68, Fs63Wo15
and Fs52Wo32, and An92Or1.
Fe/Mn = 85–110 (olivine) and 40–77 (pyroxene).
Bulk composition: (R. Zeigler and R. Korotev, WUSL) The
basalt (TiO2 = 0.8%, FeO = 21%, MgO= 14%, Th = 1.4 µg/g) is
compositionally similar to that of NWA 3160; the cumulate olivine gabbro
(TiO2 = 0.4%, FeO = 20%, MgO = 27%, Th = 1.2 µg/g) is similar to
NWA 773 and NWA 2977. All lithologies are characterized by low
concentrations of Na2O (= 0.15 ± 0.06 %) and Eu (= 0.4 ± 0.2
ppm) compared to other lunar basalts. The oxygen isotope composition (I. A.
Franchi, OU)
is consistent with lunar origin (δ17O=2.94, δ18O=5.59,
Δ17O = 0.032).
Classification: Achondrite (lunar basaltic
fragmental breccia). The specimen is another stone of the NWA
773/2700/2727/2977/3160 pair group.
Type specimens: A mass of 6.55 g is on deposit at DuPont and 0.4 g (neutron
irradiated) and one thin section at WUSL.
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from The Meteoritical Bulletin, No.
100
Northwest
Africa 6950
Mali or Algeria
Purchased: 2011 August
Mass: 771 g
Lunar meteorite (gabbro)
History: Reported to be found near the
border between Mali and Algeria in June 2011, and
purchased from the finder by Adam Aaronson in August 2011.
Physical characteristics: A single yellowish-green stone (771
g) with partial fusion crust. Thin black shock veins are visible in the
interior.
Petrography: (A. Irving and S. Kuehner, UWS)
Relatively coarse grained with a cumulate igneous texture. Aggregate
dominated by olivine, low-Ca pyroxene, pigeonite, and subcalcic augite,
with interstitial very calcic plagioclase. Accessory minerals are ilmenite,
Ti-chromite, armalcolite, troilite, baddeleyite, taenite and merrillite
with rare zirconolite and K-feldspar.
Geochemistry: Olivine (Fa31.9-32.7,
Fe/Mn=85-97), low-Ca pyroxene (Fs27.1-28.1Wo4.8-4.5,
Fe/Mn=47-55), pigeonite (Fs25.6±0.0 Wo9.2-11.1,
Fe/Mn=47-52), subcalcic augite (Fs13.9Wo36.9, Fe/Mn=41),
plagioclase (An87.9-93.0Or1.1-0.9).
Classification: Achondrite (lunar, gabbro). This
specimen is texturally and mineralogically identical to NWA 2977 and the
olivine gabbro clasts in NWA 773, NWA 2700, NWA 2727 and NWA 3333, and
evidently is paired with those stones.
Specimens: A total of 20.1 g of sample and one
polished thin section are on deposit at UWS. The main mass is held
by Aaronson.
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from The Meteoritical Bulletin,
No. 100
Northwest
Africa 7007
Western Sahara
Purchased: 2011 October
Mass: 91 g
Lunar meteorite (gabbro)
History: Found near Smara, southern Morocco
in September 2011, and purchased from a dealer in Zagora, Morocco by Greg
Hupé in October 2011.
Physical characteristics: A single dense, rounded stone (91 g)
partially coated with black fusion crust. Dark angular mineral clasts plus
sparse white clasts are visible within a finer grained dark matrix. One
small polymineralic gabbroic clast is exposed on the surface, and others
are revealed in interior slices.
Petrography: (A. Irving and S. Kuehner, UWS)
Crystal-rich regolithic breccia consisting of some larger polymineralic
clasts (gabbro and ophitic basalt) and apparently related crystal debris in
a sparse glassy, microvesicular matrix. Major components are anorthite,
complexly-zoned subcalcic augite, ferropigeonite, and relatively large
fragments composed of intergrowths of fayalite+hedenbergite+silica (typical
of subsolidus inversion assemblages from primary pyroxferroite). Accessory
phases include olivine, ilmenite, fayalite, hedenbergite, silica polymorph,
troilite, Ni-free metal and baddeleyite (to 10 µm across within fayalitic
rims on pyroxene). Matrix glass contains abundant small, round vesicles
(typical of those representing trapped solar wind gases in other lunar
regolith breccias).
Geochemistry: Zoned subcalcic augite [(core Fs22.5Wo31.2,
Fe/Mn=46), mantles (Fs34.2-50.0Wo29.6-25.9,
Fe/Mn=55-65), ferropigeonite rims (Fs66.1Wo19.7,
Fe/Mn=66)], olivine (Fa42.0-44.4, Fe/Mn=86-93), fayalite (Fa98.4,
Fe/Mn=78-84), plagioclase (An91.4.5-93.2Or0.5-0.3).
Classification: Achondrite (lunar, gabbro breccia).
Terrestrial weathering is minimal.
Specimens: A total of 18.2 g of sample and one polished thick section are
on deposit at UWS.
The main mass is held by an anonymous collector.
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from The Meteoritical Bulletin,
No. 103
Northwest
Africa 8127
(Northwest Africa)
Purchased: 2012 March
Mass: 529 g
Classification: Lunar meteorite
(gabbro)
History: Purchased by Marc Jost in March 2012
in Brugg, Switzerland from a Moroccan dealer.
Physical characteristics: Fresh, pale green stone (529 g) with
cross-cutting thin, black shock veins. Apple green clinopyroxene and glassy
maskelynite grains are visible.
Petrography: (A. Irving and S. Kuehner, UWS)
Equigranular igneous rock (mean grain size 0.8 mm) consisting of smaller
grains of olivine, Ti-bearing chromite and ilmenite (with associated
baddeleyite) poikilitically enclosed in clinopyroxene (some containing fine,
subparallel exsolution lamellae), with interstitial anorthitic plagioclase.
Most plagioclase has been converted to maskelynite, but some grains have
patchy birefringence.
Geochemistry: Olivine (Fa30.0-32.1,
FeO/MnO = 90-91), pigeonite (Fs21.4-25.1Wo10.6-9.8,
FeO/MnO = 46-54), subcalcic augite (Fs14.5-15.4Wo32.6-30.5,
FeO/MnO = 39-42). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave
(in wt.%) FeO 18.2, Na2O 0.11, and (in ppm) Sc 29.2, La 4.7, Sm
2.59, Eu 0.21, Yb 2.24, Th 0.56.
Classification: Lunar (olivine gabbro). This
specimen is paired with NWA 6950 and the gabbroic lithology in NWA 773 and
paired stones.
Specimens: 23.7 g, one polished thin section and a polished mount are at UWB. The main
mass is held by Space Jewels Switzerland.
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from The Meteoritical Bulletin,
No. 105
Northwest
Africa 10656
(Northwest Africa)
Purchased: 2016 January
Mass: 262.5 g
Classification: Lunar (diabase)
History: Purchased by Darryl Pitt in January
2016 from a Mauritanian dealer.
Physical characteristics: A single stone (262.5 g) lacking
fusion crust. The fresh interior is relatively coarse grained and is
dominated by brown, pale green and white grains.
Petrography: (A. Irving and S. Kuehner, UWS)
Intersertal texture (mean grainsize ~1.5 mm). Composed of simply-twinned
clinopyroxene (both pigeonite and subcalcic augite), olivine (with
secondary brown staining along fractures), laths of calcic plagioclase
(birefringent but with undulose extinction) and accessory ilmenite,
chromite, baddeleyite and zirconolite.
Geochemistry: Olivine (Fa33.8-34.0,
FeO/MnO = 92; Fa45.9, FeO/MnO = 87; N = 3), pigeonite (Fs25.3Wo9.7;
Fs33.6Wo11.9; FeO/MnO = 48-51, N = 2), subcalcic augite (Fs15.8-17.5Wo36.3-34.2,
FeO/MnO = 38-41, N = 3), plagioclase (An88.3-91.6Or4.1-3.4,
N = 2). Bulk composition (R. Korotev, WUSL)
INAA of whole rock powder gave (in wt.%) FeO 19.7, Na2O 0.18;
(in ppm) Sc 34.3, Cr 3190, La 12.4, Sm 5.9, Eu 0.43, Yb 4.0, Lu 0.59, Hf
4.3, Th 1.9.
Classification: Lunar (olivine diabase). This
specimen has affinities with NWA 2977, NWA 6950 and
NWA 8127
based on mineralogical and bulk compositional similarities, but differs in
texture from those meteorites.
Specimens: 22 g including one polished thin section at UWB; remainder with DPitt.
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from The Meteoritical Bulletin,
No. 105
Northwest
Africa 10985
(Northwest Africa)
Purchased: 2015
Mass: 250 g
Classification: Lunar meteorite
(gabbro)
History: Purchased by Jay Piatek in Morocco,
2015.
Physical characteristics: Single stone, weathered exterior
without fusion crust. A polished saw cut surface reveals two distinct
lithologies separated by a sharp boundary offset, with numerous truncated
grains. One lithology is a light colored, medium-grained gabbro with
elongate subhedral prismatic yellow-green pyroxenes and white subhedral
plagioclase laths. The second lithology is a dark colored, fine-grained breccia
with yellow-green pyroxene fragments scattered throughout. Fine shock melt
veins visible.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows
igneous-zoned pigeonite and augite, plagioclase, olivine, fayalite,
hedenbergite, pyroxferroite, Fe-sulfide, ilmenite, chromite, Ti-magnetite,
apatite, silica, and symplectites.
Geochemistry: C. Agee and S. Spilde, UNM) Olivine Fa38.1±21.2,
Fe/Mn=95±8, n=31; pigeonite Fs45.9±12.2Wo17.8±5.5,
Fe/Mn=63±10, n=29; augite Fs41.2±16.9Wo30.8±3.9,
Fe/Mn=63±11, n=18; pyroxferroite Fs84.2±1.4Wo14.8±1.4,
Fe/Mn=63±2, n=3; plagioclase An89.5±3.4Ab9.8±3.1Or0.7±0.6,
n=27; shock melt (proxy for bulk composition) SiO2=48.0±2.6, TiO2=1.2±0.7,
Al2O3=11.3±6.0, Cr2O3=0.4±0.2,
MgO=11.6±4.3, FeO=16.5±2.7, MnO=0.24±0.05, CaO=10.9±3.0, Na2O=0.28±0.17,
K2O=0.17±0.11 (all wt%), n=10.
Classification: Lunar gabbro
Specimens: 20.2 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.
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from The Meteoritical Bulletin,
No. 107
Northwest
Africa 11616
(Northwest Africa)
Purchased: 2017 March
Mass: 2550.8 g
Classification: Lunar meteorite
(gabbro)
History: Purchased by DPitt in March 2017 from a Mauritanian dealer.
Physical characteristics: A single very fresh specimen (2550.8
g) containing separate olivine gabbro and olivine-free basaltic clasts in a
fragmental matrix.
Petrography: (A. Irving and S. Kuehner, UWS; S. Valencia and P. Carpenter, WUSL) Polymict breccia with two
different clast types. Olivine gabbro clasts (mean grainsize 1.1 mm)
consist of equant grains of olivine, zoned clinopyroxene (pigeonite,
ferroan pigeonite, subcalcic augite) and maskelynite with accessory
chromite, ilmenite, troilite, fayalite, taenite and baddeleyite. A basalt
clast has porphyritic texture and is composed mainly of larger prismatic
grains (up to 2.5 mm long) of zoned clinopyroxene and smaller lath-like
grains of maskelynite with accessory ilmenite, chromite, troilite, silica
polymorph, rare baddeleyite, rare K-feldspar and rare Ni-poor kamacite. The
remainder of the breccia consists of related crystalline debris.
Geochemistry: Olivine gabbro clasts: olivine (Fa34.6-59.8,
FeO/MnO = 83-108, N = 9), pigeonite (Fs26.4-39.4Wo9.7-11.7,
FeO/MnO = 51-70, N = 6), ferroan pigeonite (Fs43.4-71.4Wo15.4-25.0,
FeO/MnO = 57-94, N =3), subcalcic augite (Fs17.6-28.4Wo27.2-35.6,
FeO/MnO = 51-59, N = 5), maskelynite (An85.2-95.6Or2.2-0.1,
N = 10). Basalt clast: pigeonite (Fs26.2-26.3Wo6.4-6.5;
Fs29.1Wo11.7; Fs49.8Wo19.1;
FeO/MnO = 55-73; N = 4), augite (Fs21.9-25.6Wo34.7-35.2,
FeO/MnO = 49-50, N = 2), ferropigeonite rims (Fs78.0-78.2Wo18.9-20.3,
FeO/MnO = 83-86, N = 2), maskelynite (An84.4-86.2Or3.6-2.0,
N = 2). Bulk composition (R. Korotev, WUSL) INAA of breccia subsamples gave
(in wt.%) FeO 19.1, Na2O 0.25 (in ppm) Sc 42.0, Cr 3230, La
13.6, Nd 22.9, Sm 6.73, Eu 0.578, Tb 1.37, Yb 1.37, Lu 0.66, Hf 5.1, Th
2.0.
Classification: Lunar meteorite (polymict breccia
with olivine gabbro and basalt clasts). The olivine gabbro lithology is
paired with other magnesian gabbro material present in breccia stones such
as NWA 773, NWA 2727 and NWA 3333 and
also as discrete meteorites such as NWA 2977, NWA 6950 and NWA 8127.
The olivine-free basalt lithology differs from the olivine-phyric basalt
lithology represented by NWA 3160,
and is a new member of the complex NWA 773 clan of lunar meteorites.
Specimens: 20.9 g including a polished thin section and polished endcut
at UWB; remainder with DPitt.
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from The Meteoritical Bulletin,
No. 107
Northwest
Africa 11703
(Northwest Africa)
Purchased: 2015 April
Mass: 5309.1 g
Classification: Lunar meteorite
(gabbro)
History: Purchased by Darryl Pitt in April
2015 from a dealer in Erfoud, Morocco.
Physical characteristics: A single pale greenish stone (5309.1
g) with thin cross-cutting shock veinlets.
Petrography: (A. Irving and S. Kuehner, UWS) Medium grained (grainsize up to
1.4 mm) with cumulate texture. Major minerals are olivine, pigeonite,
subcalcic augite and calcic plagioclase (predominantly converted to
maskelynite with minor birefringent domains); accessory phases include
ilmenite, taenite, troilite, Mg-merrillite and baddeleyite. Shock veinlets
contain dark glass.
Geochemistry: Olivine (Fa32.1-32.4,
FeO/MnO = 91-97, N = 3), pigeonite (Fs26.0Wo9.7; Fs27.7Wo5.7;
FeO/MnO = 47-60; N = 2), subcalcic augite (Fs16.4-17.5Wo34.9-32.3,
FeO/MnO = 46-52, N = 2), plagioclase (An89.7-91.2Or0.8-1.1,
N = 2).
Classification: Lunar (gabbro). This specimen is
texturally and mineralogically identical to NWA 2977, NWA 6950, NWA 8127,
and to the olivine gabbro clasts in NWA 773, NWA 2700, NWA 2727 and NWA
3333, and evidently is paired with those lithologies.
Specimens: 20.1 g including one polished thin section at UWB; remainder held by DPitt.
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from The Meteoritical Bulletin,
No. 107
Northwest
Africa 11767
(Northwest Africa)
Purchased: 2012
Mass: 15 g
Classification: Lunar meteorite
History: The meteorite was purchased from a
local meteorite dealer in Erfoud, Morocco.
Physical characteristics: Many small light greenish fragments
lacking any fusion crust.
Petrography: (A. Greshake, MNB) Monomict olivine-rich gabbroic breccia predominantly
composed of up to 4 mm sized Fe-rich olivine, pigeonite, augite and calcic
plagioclase. Minor phases include chromite, troilite and K-feldspar. The
meteorite contains abundant shock melt veins along which some olivine has
been transformed into ringwoodite.
Geochemistry: olivine: Fa31.6±0.2 (Fa31.3-32.0,
n=13, FeO/MnO=85-105); pigeonite: Fs25.6±1.1Wo10.7±2.8
(Fs23.3-27.7Wo5.9-16.4, n=12, FeO/MnO=46-63); augite:
Fs16.1±1.0Wo35.7±2.1 (Fs14.8-17.8Wo32.1-39.0,
n=12, FeO/MnO=41-52); calcic plagioclase: An93.1±0.8 (An91.1-93.9,
n=10).
Classification: Lunar Olivine-Gabbros. The meteorite
might be paired with NWA 773 and paired stones.
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Randy Says…
This is one of the most unusual of
lunar meteorites. It’s unlike any
rock in the Apollo collection. It contains at least 5 different igneous
lithologies. The total mass of these stones is 11.87 kg. I have not
analyzed NWA 11767 but assume it to be part of the pair group on the basis
of the description.
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Modal Mineralogy of Northwest Africa 773
Olivine Gabbro
(values in percent)
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mineral
|
Met. Bull.
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Fagan
et al.
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Jolliff
et al.
|
Bridges
et al.
|
|
olivine
|
55
|
55.5
|
48
|
66
|
|
augite
|
5
|
8.7
|
12
|
26
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|
pigeonite
|
24
|
18.9
|
28
|
|
|
hypersthene
|
|
|
2
|
|
|
plagioclase
|
15
|
14.2
|
10
|
8
|
|
alkali
feldspar
|
minor
|
1.6
|
trace
|
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|
ilmenite,
chromite, alkali feldspar, phosphates, troilite, FeNi metal
|
<1
|
<1.5
|
<1
|
<1
|
|
The
cumulate is coarse grained and the thin sections are small, so the modal mineral
proportions obtained from different sections do not agree well.
Because augite and pigeonite, both clinopyroxenes, dominate over
orthopyroxene, which is at most "minor" (Korotev et al., 2002),
the cumulate is a gabbro, not a norite. Specifically, it is an
olivine gabbro because olivine exceeds 10%. If plagioclase is actually
<10%, then it's a peridotite.
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After Stöffler
et al. (1980)
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More Information
Meteoritical Bulletin Database
Anoual
| NWA 773 | NWA
2700 | NWA 2727 | NWA
2977 | NWA 3160 | NWA
3170 | NWA 3333 | NWA
6950 | NWA 7007 | NWA 8127 |
NWA 10656
| NWA
10985 | NWA 11616
| NWA
11703 | NWA
11767
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Stöffler D., Knöll H.-D., Marvin U. B.,
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Valencia S. N., R. L. Korotev, B. L. Jolliff, and Irving A. J. (2017)
Petrography and
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Meteoritics & Planetary Science.
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Wang Y., Guan Y., Hsu W., and Eiler J. M.
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Webb S.,
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Crystal size distribution patterns for lunar meteorites
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Yokoi N., Takenouchi A., and Mikouchi T. (2018) Iron valence states of plagioclase in some lunar meteorites.
49th Lunar and Planetary Science Conference, abstract no. 2227.
Zeigler R. A., Korotev R. L., Irving A. J., Jolliff B. L., Kuehner S.
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Zeigler R. A., Korotev R. L., Jolliff B. L., Bunch T. E., and Irving
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meteorites from northwest Africa. 69th Annual Meeting of the Meteoritical
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Zeigler R. A., Korotev R. L., and Jolliff B. L. (2007) Petrography, geochemistry, and pairing relationships of
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Zhang A. and Hsu W. (2008) Mineralogical and Raman spectroscopic studies of
Northwestern Africa 2977 lunar meteorite. 71st Annual Meeting of the
Meteoritical Society, abstract no. 5122.
Zhang A. C., Taylor L. A., Hsu W. B., Floss C., Li X. H., and Liu Y.
(2010) Petrogenesis of lunar meteorite Northwestern Africa 2977:
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Conference, abstract no. 1052.
Zhang A.-C., Hsu W.-B., Floss C., Li X.-H., Qiu-Li
Li, Liu Y. and Taylor L. A. (2010) Petrogenesis of lunar meteorite
Northwest Africa 2977: Constraints from in situ microprobe results.
Meteoritics
and Planetary Science 45, 1929-1947.
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