The Meteoritical Bulletin, No.
Northwest Africa 10782
2015; Purchased: 2015 May 01
Meteorite (regolith breccia)
stone with no visible fusion crust. Recognized as a lunar breccia by L.
characteristics: One stone with no visible
fusion crust. Recognized as a lunar breccia by L. Labenne.
(R. Hewins, S. Pont, B. Zanda, MNHNP) This
is a breccia composed mainly of crystal clasts a few hundred μm in
size, with a few glassy to dendrite-bearing spherules about 1 mm in size. Matrix
is very fine-grained, in some cases glass with schlieren, with vugs or
vesicles. There are a few breccia clasts up to 4 mm, very fine grained (1-2
μm) and in some cases with igneous textures (i.e. clast-laden melt
rock clasts). Breccia clasts contain feldspathic igneous clasts with
intersertal textures resembling Apollo 14310 but finer, as well as crystal
clasts and rare lithic chips. Some pyroxene clasts show exsolution. Accessory
minerals include troilite, ilmenite, a silica phase and, in the largest
melt-rock, Ni-bearing metal.
compositions and Geochemistry: (R. Hewins ans S.
The pyroxene compositions are Fs36.7Wo7.6 to Fs55.3Wo19.6,
and the atomic Fe/Mn falls just below the UNM lunar line with average ratio 71. Both magnesian and
ferroan olivine clasts are present, with FeO/MnO of 103 falling just below
the lunar value. Spinel contains ~40 wt% Cr2O3.
Plagioclase is An93.6Ab6.2Or0.2. The
glassy matrix is basaltic (sensu lato).
(R. Hewins MNHN)
Lunar breccia. The meteorite contains anorthite with olivine and pyroxene
Fe/Mn ratios matching lunar. As it contains Ni-rich metal, glass spherules
and breccia clasts it is classified as a regolith breccia.
The main mass (31 g) is held by Labenne.
The type specimen consists of 0.977 g and 6.88 g at MNHNP.