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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.
|
|
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.
|
|
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.
|
|
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
(85.2-95.6Or2.2-0.1, 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.
|
|
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.
|
|
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.
|
|
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.
|
|
Modal Mineralogy of Northwest Africa
773 Cumulate Portion
(values in percent)
|
|
|
Met.Bull.
|
Fagan
et al.
|
Jolliff
et al.
|
Bridges
et al.
|
|
olivine
|
55
|
55.5
|
48
|
66
|
|
augite
|
5
|
8.7
|
12
|
26
|
|
pigeonite
|
24
|
18.9
|
28
|
|
hypersthene
|
|
|
2
|
|
plagioclase
|
15
|
14.2
|
10
|
8
|
|
alkali
feldspar
|
minor
|
1.6
|
trace
|
|
|
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.
|
|
After Stöffler et al. (1980)
|
|
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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Nyquist
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Webb
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Yokoi
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