The Meteoritical Bulletin, No.
Northwest Africa 11523
meteorite (feldspathic breccia)
Purchased in March 2017 from Aziz Habibi in Erfoud, Morocco.
characteristics: Single stone. A saw cut
reveals a breccia dominated by white feldspathic clasts set in a dark-gray
groundmass, some desert caliche is present along cracks.
(C. Agee, UNM) Microprobe
examination shows fragmental breccia of olivine, pyroxene, and plagioclase.
Melt veins and vesicles are present throughout. Augite and pigeonite show
subparallel iron-enrichment trends. There appears to be only one population
of augite and pigeonite pairs suggesting that this is a monomict breccia.
Plagioclase is uniform in composition at 98.5±0.2% anorthite. Ubiquitous
minor ilmenite, chromite, and Fe-Ni metal were observed.
Agee, UNM) Olivine Fa26.2±7.1,
Fe/Mn=89±5, n=9; pigeonite Fs32.6±5.5Wo6.5±4.1,
Fe/Mn=60±5, n=8; augite Fs26.6±8.6Wo36.4±4.6,
Fe/Mn=55±8, n=8; plagioclase An98.5±0.2Ab1.4±0.2Or0.1±0.0,
n=8; shock melt vein (proxy for bulk composition) SiO2=43.3±0.7,
TiO2=0.16±0.03, Cr2O3=0.10±0.05, Al2O3=25.9±3.6,
MgO=8.7±4.2, FeO=6.0±2.3, MnO=0.07±0.02, CaO=15.0±2.1, Na2O=0.30±0.07,
K2O=0.03±0.01 (all wt%), n=5.
Lunar, monomict feldspathic breccia
20.6 g on deposit at UNM, DPitt
holds the main mass.