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from The
Meteoritical Bulletin, No. 107
Northwest Africa 12270
Mauritania
Purchased:
2018
Mass: 1300
g
Lunar
Meteorite (feldspathic breccia)
History: Purchased by Terry Boudreaux from a meteorite dealer in
Mauritania.
Physical characteristics: Six
identically appearing pieces, no fusion crust, saw cut reveals a fragmental
breccia with numerous white feldspathic clasts set in a dark gray ground
mass.
Petrography: C. Agee, UNM) This meteorite consists of
primarily of fragmental pyroxene, olivine, feldspathic clasts and shock
melt. Ubiquitous Ti-rich chromite and ilmenite present, rare Fe-Ni metal
detected.
Geochemistry: (C. Agee, UNM) olivine Fa42.7±7.3,
Fe/Mn=94±9, n=14; pigeonite Fs37.0±8.0Wo17.9±6.9,
Fe/Mn=56±5, n=13; plagioclase An, n=6; Shock melt (20 μm defocused
electron beam, proxy for bulk meteorite composition): SiO2=44.8±1.3,
TiO2=0.31±0.08, Al2O3=26.0±3.9, Cr2O3=0.15±0.09,
MgO=5.0±2.2, FeO=5.9±1.7, MnO=0.08±0.03, CaO=16.1±1.8,
NiO=0.02±0.01, Na2O=0.44±0.07, K2O=0.08±0.01
(all wt%), n=7.
Classification: Lunar
feldspathic breccia
Specimens: 29.2 g including
a probe mount on deposit at UNM,
Terry Boudreaux holds the main
mass.
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