The Meteoritical Bulletin, no. 101.
Purchased: August 2012
Mass: 503 g
meteorite (feldspathic breccia)
History: Found in
July 2011, reportedly near Zag, Morocco. Purchased by Jay Piatek and Matt Morgan in August 2012 from a dealer in Ouarzazate.
Physical characteristics: Six
matching separate stones (total weight 503 g), consisting of two larger
stones (341 g and 146 g) and four smaller pieces (total 16 g). Irregular,
desert-weathered exterior with heavy patina in places and visible light and
dark patches. Sawn slices exhibit a brecciated texture dominated by medium
gray, tan and white lithic clasts plus white feldspar grains (up to 5 mm
across) set in a sparse, darker gray matrix. Some thin veins of terrestrial
weathering products visible.
Petrography: (C. Agee, UNM; A.
Irving, UWS; R. Mills,
Microprobe examination of five polished mounts and a complete slice shows
this specimen to be a fragmental breccia composed primarily of quenched
melt clasts and calcic plagioclase grains occurring in a wide range of
grain sizes. There are numerous scattered olivine and zoned pyroxene grains
throughout, rare grains of exsolved pigeonite, ilmenite, Ti-chromite,
troilite, silica polymorph and iron metal. Shock melt domains are common
containing plagioclase grains set in a matrix of quench crystals. A single
"granophyre" clast (100 microns across) composed of intergrown K-feldspar+silica was observed. Secondary barite and
iron oxide/hydroxide were detected.
Geochemistry: (C. Agee
and M. Spilde, UNM; A. Greshake and P. Czaja,
MNB; A. Irving
and S. Kuehner, UWS). Olivine
Fa39.6±7.8, Fe/Mn=94±8, n=49; low-Ca pyroxene Fs37.4±7.0Wo4.7±1.6,
Fe/Mn=57±8, n=30; pigeonite Fs34.4±9.4Wo12.9±4.0,
Fe/Mn=60±5, n=15; high-Ca pyroxenes Fs26.9±10.9Wo38.4±4.6,
Fe/Mn=58±9, n=15; plagioclase An96.6±0.6Ab3.3±0Or0.2±0.15,
n=17. Bulk composition (R. Korotev, WUSL). INAA on 18 subsamples gave the following mean
values: Na2O=0.331, CaO=16.3, FeO=4.52 (all wt%); Sc=8.67,
Cr=587, Co=12.48, Ni=81, La=2.09, Nd=3.2, Sm=0.984, Eu=0.772, Lu=0.111,
Hf=0.63, Ir=0.0037, Au=0.0021, Th=0.29, U=0.16 (all ppm).
Oxygen Isotopes, laser
fluorination (K. Ziegler, UNM), 12
analyses on 5 acid-washed aliquots gave mean values d17O=2.963±0.126,
d18O=5.646±0.316, Δ17O=-0.018±0.06 (linearized,
(lunar, feldspathic breccia)
Specimens: A total of
30 g of material including two probe mounts are on deposit at UNM. The
remainder is divided between Dr. J. Piatek and
Mr. M. Morgan, with Dr. J. Piatek holding the
main portion of the largest stone and the other five stones.