The Meteoritical Bulletin, no. 103
Abar al' Uj 012
Sharqiyah, Saudi Arabia
31 Jan 2012
Lunar meteorite (feldspathic breccia)
Found by Edwin Gnos, Beda Hofmann, Khalid al Wagdani,
Ayman Majoub, Abdulaziz Solami, Siddiq Habibullah, Maruan Al Bokari during a
search for meteorites on January 31, 2012.
characteristics: Medium gray stone with a
total mass of 122.78 g. The wind-ablated meteorite consists of two fitting
fragments, with masses of 104.5 and 18.27 g, respectively. Fusion crust is
absent. Contains black, white and red mineral and lithic clasts (up to 6
mm) embedded in a very fine-grained matrix. Vesicles are abundant. Some
vesicles and thin cracks are filled with terrestrial mineral assemblages.
(B. Hofmann NMBE;
M. Mészáros NMBE/Bern) Clast-rich impact-melt breccia, consisting of partly
resorbed mineral clasts (up to 1 mm) and subrounded/rounded lithic clasts
(up to 6.8 mm) set in a very fine-grained, well-crystallized impact-melt
matrix. Most common mineral clasts are plagioclase with minor pyroxene and olivine.
The lithic clast population is dominated by anorthositic breccias. Rare
clasts of igneous rocks and a single basalt clast were observed. Vesicles
(up to 3.0 mm diameter) are abundant. Shock features (polycrystalline
grains, mosaicism, recrystallization) were observed
in pyroxenes, olivine and plagioclase. Trace mineral phases are troilite,
FeNi-metal, spinel (pleonast), SiO2
and terrestrial alteration products (carbonates, celestine, Fe-hydroxides).
(N. Greber, M. Mészáros,
Bern) Mineral composition:
feldspar (n=46): An93.4-97.7 Or0.0-1.6; olivine
(n=7): Fa28.4-35.3, Fe/Mn=95.7; orthopyroxene (n=1): Wo3.6
Fs25.2, Fe/Mn=52.8; clinopyroxene (n=10): Wo5.1-40.6
Fs12.8-36.9, Fe/Mn=89.9. Bulk analysis (ICP/ICPMS):
Al2O3=28.9 wt%, FeO=5.0 wt%, Sc=8 ppm, Sm=1.2 ppm,
Th=0.5 ppm. Oxygen isotopes: (R. Greenwood, OU): ?18O=5.46 permil, ?17O=2.86 permil
Lunar feldspathic impact-melt breccia.
Type material (25.1 g) and 3 polished thin sections at MHNGE, main mass at SGS.