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Lunar Meteorite
Northwest Africa 7834, 7948, 8306, 10263,
10317, 10376, 10546, 10599, 10644, 10810, 10989, & 11185
(presumed paired stones)
northwestern
Africa
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NWA
7834
(photo
credit: Rachid Chaoui)
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NWA
7948
(photo
credit: Rachid Chaoui)
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NWA
8306
(photo
credit: Said Haddany)
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Sawn
slices of NWA 8306
(photo
credit: Darryl Pitt)
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The
2 stones of NWA 10263
(photo
credit: Rachid Chaoui)
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Photomicrograph
of a thin section of NWA 10317
(photo
credit: Addi Bischoff)
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Sawn
face of Northwest Africa 10376
(photo
credit: Philippe Schmitt-Kopplin)
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A
slice of NWA 10546
(photo
credit: Pierre-Marie Pelé)
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Sawn
faces of Northwest Africa 10599
(photo
credit: Carl Agee)
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Two
faces of a saw cut through Northwest Africa 10644. Click on image for
enlargement.
(photo
credit: Mendy Ouzillou)
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The
four stones of Northwest Africa 11185
(photo
credit: Ben Hoefnagels)
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Lab
samples of NWA 7834
(photo
credit: Randy Korotev)
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Lab
samples of NWA 7948
(photo
credit: Randy Korotev)
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Lab
samples of NWA 8306. Click on image for enlargement.
(photo
credit: Randy Korotev)
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Two
views of chips of NWA 10263
(photo
credit: Randy Korotev)
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Lab
sample of NWA 10317. Thanks to Stephan Decker for the sample.
(photo
credit: Randy Korotev)
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Lab
sample of NWA 10376. Thanks to Philippe Schmitt-Kopplin for the
sample.
(photo
credit: Randy Korotev)
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Two
sides of lab sample of Northwest Africa 10599. Thanks to Frank Carroll for
the sample.
(photo
credit: Randy Korotev)
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Lab
sample of NWA 10546
(photo
credit: Randy Korotev)
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Two
sides of lab sample of NWA 10644. Thanks to Mendy Ouzillou
for the sample.
(photo
credit: Randy Korotev)
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Two
sides of a slice of NWA 10810 Thanks to Anthony Love for the sample.
(photo
credit: Randy Korotev)
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Two
sides of lab sample of NWA 10989. Click on image for enlargement. Thanks to
Mahesh Anand and Helen Ashcroft for the sample.
(photo
credit: Randy Korotev)
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Chips
of unnamed 93
(photo
credit: Randy Korotev)
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from
The Meteoritical Bulletin, No. 102
Northwest
Africa 7834
(Northwest
Africa)
Purchased: 2013 February
Mass: 905 g
Classification:
Lunar meteorite (feldspathic breccia)
History:
Purchased jointly by Darryl Pitt and David Gheesling in February 2013 from
a dealer in Zagora, Morocco.
Petrography: (A.
Irving and S. Kuehner, UWS)
Breccia consisting of numerous mineral fragments and rare ophitic-textured
mare basalt clasts in a vesicular, glassy matrix. Minerals are anorthite,
olivine, unexsolved pigeonite, subcalcic augite,
exsolved pigeonite, Ti-bearing chromite, Cr-bearing ulvöspinel, ilmenite,
troilite, minor silica polymorph and tiny shred-like grains of kamacite.
Geochemistry:
Olivine (Fa32.3, FeO/MnO = 93; Fa92.9, FeO/MnO = 83),
pigeonite (Fs28.8-35.4Wo9.9-5.7; FeO/MnO = 52-56),
subcalcic augite (Fs18.0Wo37.9; FeO/MnO = 46). Bulk
composition (R. Korotev, WUSL):
INAA of subsamples gave mean abundances of FeO 12.9 wt.%, and (in ppm) Sc
25, La 6.4, Sm 3.1, Eu 0.81, Yb 2.3, Th 0.9.
Classification:
Lunar (mingled regolithic breccia).
Specimens:
20.2 g are at UWB.
The remainder is with the owners.
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from
The Meteoritical Bulletin, No. 102
Northwest
Africa 7948
(Northwest
Africa)
Purchased: 2013 April
Mass: 59.8 g
Classification:
Lunar meteorite (feldspathic breccia)
History: Purchased
by Eric Twelker in April 2013 from a dealer in Zagora, Morocco.
Petrography: (A.
Irving and S. Kuehner, UWS)
Fresh specimen composed of angular clasts (some lithic clasts up to 1.2 cm
across, but mostly mineral fragments) in a finer grained, dark matrix.
Minerals present are anorthite, olivine, pigeonite, subcalcic augite,
Ti-chromite, troilite, rare silica polymorph and a shred-like grain of
kamacite. A thin vesicular, glassy shock vein was found.
Geochemistry:
Olivine (Fa37.8-61.2; FeO/MnO = 90-107), pigeonite (Fs27.1-28.1Wo13.3-11.0;
FeO/MnO = 56-58), subcalcic augite (Fs17.1-22.3Wo35.9-29.9;
FeO/MnO = 41-53), ferroan subcalcic augite (Fs44.0Wo39.4;
FeO/MnO = 74), anorthite (An90.4-92.0Or0.3-0.4). Bulk
composition (R. Korotev, WUSL):
INAA of subsamples gave mean abundances of FeO 8.8 wt.%, and (in ppm) Sc
16, La 6.5, Sm 3.1, Eu 0.92, Yb 2.2, Th 1.0.
Classification:
Lunar (mingled regolithic breccia).
Specimens:
12.2 g are at UWB.
The remainder is with Twelker.
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from
The Meteoritical Bulletin, No. 103
Northwest
Africa 8306
(Northwest
Africa)
Purchased: 2014 February
Mass: 1389 g
Classification:
Lunar meteorite (feldspathic breccia)
History: Puchased by Darryl Pitt in February 2013 from a
Moroccan dealer at the Tucson Gem and Mineral Show.
Physical
characteristics: Single stone (1389 g) lacking fusion
crust and composed of pale gray, pale yellow and white clasts in a very
dark gray matrix.
Petrography: (A.
Irving and S. Kuehner, UWS)
Breccia composed of angular clasts in a partly glassy matrix containing
trapped microbubbles. Minerals are olivine, pigeonite, fayalite, anorthite,
silica (as separate clasts), hedenbergite, Ti-poor chromite, Ti-rich
chromite, ilmenite, and minor exsolved pigeonite, baddeleyite, kamacite and
barite. One fine grained, quenched-textured basaltic clast was found.
Geochemistry:
Olivine (Fa26.5-36.0; FeO/MnO = 102-116, N = 3), pigeonite (Fs19.8-24.0Wo19.9-17.0;
FeO/MnO = 47-56; Fs28.8Wo6.5; FeO/MnO = 55), fayalite
(Fa72.6; FeO/MnO = 104). Bulk composition (R. Korotev, WUSL) INAA
of subsamples gave the following mean abundances (in wt.%) FeO 8.9, Na2O
0.41; (in ppm) Sc 17.1, Ni 230, La 7.3, Sm 3.30, Eu 0.93, Yb 2.30, Lu
0.317, Hf 2.4, Th 1.0.
Classification:
Lunar (feldspathic regolithic breccia).
Specimens:
A 20.2 g specimen with one polished surface is at UWB. The
main mass is held by DPitt.
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from
The Meteoritical Bulletin, No. 104
Northwest
Africa 10263
Mauritania
Purchased: 2015 May
Mass: 1015 g
Classification:
Lunar meteorite (feldspathic breccia)
History: Two
identical stones found together in Mauritania were purchased by Darryl Pitt
in May 2015 from a dealer in Zagora, Morocco.
Physical
characteristics: No fusion crust is evident. The interior
of each stone consists of white to light gray clasts set in a dark gray
matrix.
Petrography: (A.
Irving and S. Kuehner, UWS)
Fragmental breccia composed of angular mineral clasts of anorthite,
pigeonite, olivine, orthopyroxene, subcalcic augite, augite, fayalite,
silica polymorph, ilmenite, kamacite, rare zircon and rare taenite in a
finer grained matrix.
Geochemistry:
Olivine (Fa32.6-33.8, FeO/MnO = 87-102, N = 3), orthopyroxene
(Fs26.1Wo4.0, FeO/MnO = 53), pigeonite (Fs27.5-41.8Wo11.2-11.4,
FeO/MnO = 55-59; Fs61.8Wo21.0, FeO/MnO = 68; N = 3),
subcalcic augite (Fs41.5-51.7Wo30.9-32.6, FeO/MnO =
64, N = 2), fayalite (Fa93.6, FeO/MnO = 84), plagioclase (An93.2-94.8Or0.2-0.5,
N = 3). Bulk composition (R. Korotev, WUSL)
INAA of subsamples gave the following mean abundances (in wt.%) FeO 11.6,
Na2O 0.43; (in ppm) Sc 23.4, La 8.7, Sm 4.0, Eu 0.91, Yb 2.7, Lu
0.40, Th 1.3.
Classification:
Lunar (feldspathic fragmental breccia).
Specimens:
20.65 g including one polished endcut at UWB; main mass with DPitt.
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rom
The Meteoritical Bulletin, No.
104
Northwest
Africa 10317
Morocco
Purchased: 6 Jul 2015
Mass: 11.0 g
Classification: Lunar meteorite
History: The single
individual of 11.0 g was found Morocco and purchased in Dakhla, Morocco,
July 6, 2015.
Petrography: (A. Bischoff
and S. Ebert, IfP)
Fine-grained breccia consisting of small mineral and lithic clasts of
anorthositic rocks, impact melt rocks and breccias, granulitic lithologies,
anorthite, olivine, pyroxenes, and opaques embedded in a fine-grained,
well-lithified matrix.
Geochemistry: Mineral
compositions and geochemistry: Olivine (Fa34.1±2.3, range: Fa28.8-36.9;
mean Fe/Mn =96, n = 10), low-Ca pyroxene (Fs28.2-69.2Wo3.8-19.5,
mean Fe/Mn = 46.2, n = 5), Ca-pyroxene (Fs16.9-63.2Wo24.8-39.2,
Fe/Mn = 57.4), plagioclase (An96.0±1.5; range: An92.8-97.3;
n = 9)
Classification: Lunar
(feldspathic breccia)
Specimens: 2.2 g
including one polished thin section at IfP; main mass with S. Decker
(Meteorite-Museum, 55430 Oberwesel, Germany)
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from
The Meteoritical Bulletin, No. 104
Northwest
Africa 10376
(Northwestern
Africa)
Purchased: 2015
Mass: 20 g
Lunar meteorite
History: The
meteorite was purchased from the meteorite dealer Med Lamine
Ahmed.
Physical
characteristics: One small grayish individual lacking any
fusion crust was found in the northern Sahara.
Petrography: The
meteorite is a polymict breccia composed of lithic and mineral clasts
consolidated in a fine-grained clastic, partly molten and recrystallized
matrix. Lithic clasts are dominantly basaltic and gabbroic, mineral clasts
include up to 200 μm sized olivine, exsolved pyroxene, and feldspar
grains. Accessories are Ti-chromite, pyrrhotite, ilmenite, and silica. Some
calcite weathering veins are present.
Geochemistry: low-Ca pyroxene: Fs29.3Wo4.8
FeO/MnO=51; Ca-pyroxene: Fs16.3±1.3Wo36.3±2.5 (Fs4.1-18.8Wo31.1-40,
n=11, FeO/MnO=41-65); feldspar: An86.3±11.4Ab13.1±11
(An56-93.6Ab6.3-42.3, n=16).
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from
The Meteoritical Bulletin, No. 105
Northwest
Africa 10546
(Northwest
Africa)
Purchased: 2015 Nov
Mass: 43.35 g
Classification:
Lunar meteorite (feldspathic breccia)
History:
Purportedly found near the border between Mauritania and Mali. Purchased by
Pierre-Marie Pelé in November 2015 from a dealer in Ouarzazate, Morocco.
Petrography: (A.
Irving and S. Kuehner, UWS)
Fragmental breccia composed of mineral clasts of anorthite, olivine,
pigeonite, augite, subcalcic augite, silica polymorph, ilmenite (with
inclusions of baddeleyite), Ti-Al-chromite and rare zircon. Microbubbles
are present in parts of the finer grained matrix along with minor secondary
barite.
Geochemistry:
Olivine (Fa23.1-39.3; Fa86.9; FeO/MnO = 83-95; N =
4), pigeonite (Fs21.7Wo13.9; Fs54.2Wo21.9;
FeO/MnO = 52-65; N = 2), augite (Fs13.0Wo37.8,
FeO/MnO = 39), subcalcic augite (Fs32.8Wo31.9,
FeO/MnO = 49), ferroan augite (Fs51.5Wo40.5, FeO/MnO =
72), plagioclase (An90.3-93.3Or0.4-0.1, N = 2).
Classification:
Lunar (feldspathic breccia).
Specimens: A
9.72 g polished endcut piece is at PSF;
remainder with Mr. P. Pelé.
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from
The Meteoritical Bulletin, No. 105
Northwest
Africa 10599
(northwestern
Africa)
Purchased: 2015
Mass: 77.8 g
Classification: Lunar meteorite (feldspathic breccia)
History:
Purchased from Youssef Ait El Caid,
Morocco, 2015.
Physical
characteristics: One piece, no fusion crust, irregular
weathered exterior, saw cut reveals prominent white feldspathic clasts set
in a dark-gray groundmass.
Petrography: (C.
Agee, UNM) Microprobe examination
shows a polymict breccia with fragmental plagioclase, pyroxene, and olivine
grains, lithic fragments, shock melt domains, and small vesicles. Pyroxenes
are subcalcic augite and pigeonite with iron enrichment trends. Most
olivine is approximately Fa37 however there were also a few
fayalitic olivines (Fa62) observed. Likewise, anorthite is the
predominate plagioclase composition, but there were also a few bytownite
(An85) grains observed.
Geochemistry: (C.
Agee and M. Spilde, UNM). Olivine Fa37.1±2.4, Fe/Mn=95±8, n=7; pigeonite
Fs46.3±9.2Wo6.4±1.7, Fe/Mn=65±1, n=3; augite Fs36.5±12.2Wo24.6±2.7,
Fe/Mn=59±4, n=3; plagioclase An95.6±1.1, n=4; Shock melt (20
μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.03±0.87,
TiO2=0.50±0.21, Al2O3=26.95±2.82, Cr2O3=0.14±0.04,
MgO=5.51±1.57, FeO=6.75±1.84, MnO=0.09±0.03, CaO=15.36±1.12, NiO=0.03±0.02, Na2O=0.54±0.08, K2O=0.09±0.02
(all wt%), FeO/MnO=80±16, n=10.
Classification:
Achondrite (lunar feldspathic breccia)
Specimens: A
total of 16 g including a probe mount on deposit at UNM. Frank Carroll holds the main mass.
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from
The Meteoritical Bulletin, No. 105
Northwest
Africa 10644
(Northwest
Africa)
Purchased: 2016
Mass: 166 g
Lunar
meteorite (feldspathic breccia)
History:
Purchased by Dustin Dickens, February 2016, from a Moroccan dealer and sold
to Mendy Ouzillou.
Physical
characteristics: Single stone, irregular exterior, no fusion
crust. A saw cut reveals light-gray feldspathic clasts (up to 1 cm) and
some smaller, fragmental, white plagioclase grains set in a dark-gray
groundmass.
Petrography: (C.
Agee, UNM) This is a feldspathic breccia
showing several different textural domains: 1) poikilitic plagioclase with
olivine and pyroxene inclusions, 2) zones of fragmental plagioclase,
olivine, and pyroxene, 3) cataclastic zones of fine-grained (~20 μm)
silicates, 4) vesicular shock melt veins and pockets. Pigeonite and augite
show significant igneous, iron-enrichment trends.
Geochemistry: (C.
Agee and S. Spilde, UNM) Olivine Fa37.9±1.6, Fe/Mn=98±6, n=13; pigeonite
Fs39.3±13.9Wo17.0±4.1, Fe/Mn=66±9, n=11; augite Fs32.0±22.7Wo37.4±1.1,
Fe/Mn=60±20, n=2; plagioclase An97.6±0.5, n=5; Shock melt (20
μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.7±0.1,
TiO2=0.5±0.1, Al2O3=29.2±2.5, Cr2O3=0.09±0.05,
MgO=4.0±1.4, FeO=5.3±1.7, MnO=0.06±0.02, CaO=16.4±1.0, NiO=0.03±0.02,
Na2O=0.48±0.01, K2O=0.10±0.01 (all wt%), n=5.
Classification:
Lunar (feldspathic breccia).
Specimens:
20.73 g including a probe mount on deposit at UNM; Mendy Ouzillou holds the main
mass.
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from
The Meteoritical Bulletin, No. 105
Northwest
Africa 10810
Mauritania
Purchased: 2015
Mass: 402.4 g
Classification:
Lunar meteorite (feldspathic breccia)
History: Two
stones weighing 126.2 and 276.2 g were found in Mauritania and subsequently
purchased in Rissani in 2015. J. Donald Cline and
John Sinclair acquired the samples from a meteorite prospector at the
Tucson Gem and Mineral Show in February 2016.
Physical characteristics:
Sample has an irregular-ovoid shape and lacks fusion crust. The exterior
surface is weathered and light orangish-gray in color.
One half of the stone shows an obvious brecciated texture composed of
dominant light-colored clasts in a dark matrix. The other half appears to
have been buried and contains an orangish layer
of caliche. One edge has a window cut into the stone showing a mixture of
rounded dark and light-colored lithic and mineral clasts in a dark brown
matrix. One slice contains an FeNi grain.
Petrography:
Description and classification (A. Love, App): Sample is a polymict breccia composed of 5 mm sub-rounded
to angular lithic clasts and mineral clasts set within a micro-vesicular
black glassy matrix. Up to 5 mm subrounded to subangular clasts of olivine
gabbro with exsolved pyroxenes, troctolite, subophitic olivine basalt and
exsolved pyroxenes, granulitic anorthosite and poikolitic
crystalline impact melt breccia are the dominant lithic fragments
represented in the sample. Additionally, the sample contains mineral
grains, and symplectites composed of fayalite, Si-rich grains and
Ca-pyroxene in addition to glassy spherules and flow-banded agglutinates.
Accessory minerals ilmenite, ferroan chromite, fayalite and a silica
polymorph.
Geochemistry: (A.
Love, App): Olivine (Fa23.1-45.3;
FeO/MnO=95.8-114.7, N=20), pigeonite (Fs25.8-30.1Wo16.3-7.3
N=14; Fs46.4-57.2Wo20.0-7.8; FeO/MnO=54.4-73.5, N=4);
augite (Fs16.5-21.5Wo23.8-38.5; FeO/MnO=47.2-52.0,
N=9); fayalite (Fa90.7-97.6; FeO/MnO=93.3-96.8, N=6);
plagioclase An95.0±2.7Or0.2±0.2, N=13). Bulk
Composition: (R. Korotev, WUSL): INAA of 100 mg gave (in wt%) Na2O 0.4,
FeO 10.9; (in ppm) Sc 19.7, Cr 17.8, Co 42.1, Ni 220, La 7.3, Sm 3.3, Eu
0.91, Yb 2.3, Lu 0.3, Hf 2.5, Th 1.1.
Classification:
Lunar (mingled regolith breccia)
Specimens:
PARI
holds the main masses (276.2 and 89.07 g). A slice and an end cut weighing
20.82 g and one polished thin section are on deposit at App.
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from
The Meteoritical Bulletin, No. 105
Northwest
Africa 10989
(Northwest
Africa)
Purchased: 2015
Mass: 14.4 g
Classification:
Lunar meteorite
History: This
stone was one of a group found in northwest Africa, near to the
Morocco/Algeria border; exact date and weights of other stones is unknown.
Purchased in 2015 from a Moroccan Dealer in Morocco.
Physical characteristics: The
total mass of the single stone was 14.4 g, and is dark brown in color with
a dark brown/black fusion crust.
Petrography: H.
Ashcroft, M. Anand, OU. A fragmental breccia
containing a variety of mineral (up to 1 mm) and lithic (up to 1 × 3 mm)
fragments in a dark matrix composed of finer-grained crystals and a dark,
vesicular glass. Both basaltic and feldspathic fragments are present in
roughly equal proportions. The breccia has a seriate fabric and the
proportion of glass and crystals in the matrix varies throughout the
sample. Some crystals exhibit evidence for shock and alteration (offset
pyroxene lamellae, recrystallized and maskelynitised
plagioclase). Minor secondary calcite veins and barite are seen throughout
the sample. Minerals are Olivine (forsteritic and fayalitic), Pyroxene
(Orthopyroxene, Pigeonite, Augite), Anorthite and trace amounts of
ilmenite, chromite, kamacite, schreibersite, apatite, merrilite,
silica.
Geochemistry:
Feldspar crystals are anorthitic and vary between An80-90, with
an average of An94 (N = 184). Some feldspars are recrystallized,
and others have been maskelynitised. A continuum
of pyroxene compositions (pigeonite to augite) are observed with a range in
Fs15-64, and Wo5-43. Four main clusters in olivine
composition are observed with Fa37, Fa51 and Fa70.
Some Fayalite (Fa90) is also observed. One mafic clast contains
orthopyroxene (Wo3En75Fs22), Olivine, (Fa75)
and anorthite (An95). One hedenbergite-fayalite-silica
symplectite is observed. The oxygen isotopes (R. Greenwood and I. Franchi, OU) are consistent with a lunar origin with δ17O
3.42 ‰, δ18O 6.51 ‰, Δ17O 0.03 ‰. Average
FeO/MnO for Olivine is 105, and Pyroxene is 66.
Classification:
Lunar (mixed fragmental breccia)
Specimens:
Main mass resides with G. Ensor. The type specimen (3.4 g) is deposited in
the OU
meteorite collection.
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from
The Meteoritical Bulletin, No. 106
Northwest
Africa 11185
(Northwest
Africa)
Purchased: 2016 June
Mass: 94.02 g
Classification:
Lunar meteorite (feldspathic breccia)
History:
Purchased by Ben Hoefnagels in June 2016 from a
dealer in Taliouine, Morocco.
Physical characteristics: Four
stones (total weight 94.02 g) of very similar appearance purchased together
from the same dealer exhibit the same types of white clasts in a dark-gray
matrix.
Petrography: (A.
Irving and S. Kuehner, UWS)
Breccia composed of angular mineral grains of anorthite, olivine,
pigeonite, exsolved pigeonite, subcalcic augite, augite, Ti-Al-chromite,
ilmenite and fayalite in a finer grained matrix containing low-Ni kamacite,
taenite, troilite, baddeleyite and Mg-ilmenite. A quench-textured melt rock
clast was also observed.
Geochemistry:
Olivine (Fa34.1, FeO/MnO = 107; Fa91.2, FeO/MnO = 82;
N = 2), pigeonite (Fs22.4-28.6Wo15.0-8.1, FeO/MnO =
64-68, N = 2), subcalcic augite (Fs20.7Wo30.7,
FeO/MnO = 58), augite (Fs50.2Wo37.5, FeO/MnO = 65),
plagioclase (An93.5Or0.4; An85.5Or1.2;
N = 2). Bulk composition (R. Korotev, WUSL): INAA of subsamples of
two stones gave INAA of subsamples gave the following mean abundances (in
wt.%) FeO 10.0, Na2O 0.43; (in ppm) Sc 18.9, Ni 300, La 8.3, Sm
3.86, Eu 0.98, Yb 2.64, Lu 0.37, Hf 2.8, Th 1.2.
Classification:
Lunar (feldspathic breccia)
Specimens:
19.1 g including a 10.3 g polished endcut from one stone at UWB; remainder with Mr. B. Hoefnagels.
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Randy
Says…
These
stones may all be paired with the NWA 10149 pair
group.
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More
Information
Meteoritical
Bulletin Database
NWA
7834 | 7948 | 8306 | 10263 | 10317 | 10376 | 10509 | 10546 | 10644 | 10810 | 10989 | 11185
References
Ashcroft
H. O., Anand M., Korotev R. L., Greenwood R. C., Franchi
I. A., and Strekopytov S. (2017) NWA 10989 – A
new lunar meteorite with equal proportions of feldspathic and VLT material.
48th Lunar and Planetary Science Conference, abstract no. 1481.
Korotev
R. L. and Irving A. J. (2014) Keeping up
with the lunar meteorites — 2014. 45th Lunar and Planetary Science
Conference, abstract no. 1405.
Korotev
R. L. and Irving A. J. (2015) Keeping up
with the lunar meteorites — 2015.
46th Lunar and Planetary Science Conference, abstract no. 1942.
Korotev
R. L. and Irving A. J. (2016) Not quite
keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary
Science Conference, abstract no. 1358.
Korotev R. L. and Irving A.
J. (2017) Still not keeping up with the lunar
meteorites – 2017. 48th Lunar and Planetary Science Conference,
abstract no. 1498.
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