The Meteoritical Bulletin, No.
Northwest Africa 11783
20 September 2014
meteorite (feldspathic breccia)
Purchased by Jay Piatek from a Moroccan meteorite
characteristics: Several visually identical
appearing pieces. No fusion crust. A saw cut reveals a fragmental breccia
with white feldspathic clasts set in a dark gray ground mass.
(C. Agee, UNM) This meteorite is
a breccia of fragmental pyroxene, olivine, plagioclase grains. There are
many domains that are fine-grained and cataclastic
with shock melt and vesicles. Fe-metal, chromite, ilmenite, silica, and a
phosphate mineral were detected.
Agee, UNM) olivine Fa: 28.1±4.8,
Fe/Mn=100±2, n=4; clinopyroxene Fs19.0±4.4Wo23.1±17.6,
Fe/Mn=52±8, n=3; plagioclase An94.6±1.3, n=3; Shock melt (20
μm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.0±0.4,
TiO2=0.51±0.02, Al2O3=28.0±0.5, Cr2O3=0.11±0.01,
MgO=6.0±0.2, FeO=4.7±0.2, MnO=0.07±0.00, CaO=15.3±0.1,
Na2O=0.61±0.03, K2O=0.16±0.01 (all wt%), n=7.
Lunar feldspathic breccia.
13 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.