NWA 11173 (10,052 g)
Northwest Africa 11173 (NWA 11173)
Classification: HED achondrite (Eucrite, brecciated)
History: The meteorite was bought in 2016 from a meteorite dealer in Morocco.
Physical characteristics: Dark grayish indidual partly covered with fusion crust.
Petrography: The meteorite is a breccia composed of fine- and coarse-grained basaltic clasts both dominated by exsolved pyroxene and lath shaped calcic plagioclase. Grain sizes vary from few µm in fine-grained lithologies to up to 300 μm in coarse-grained clasts. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron was found. The meteorite contains shock melt veins.
Geochemistry: low-Ca pyroxene: Fs65.9±0.8Wo5.4±1.0 (Fs65.0-67.5Wo3.6-6.2, n=11, FeO/MnO=29-32); Ca-pyroxene: Fs40.7±3.1Wo33.7±3.7 (Fs33.9-44.7Wo29.4-41.7, n=12, FeO/MnO=30-37); calcic plagioclase: An78.8±2.7 (An74.4-82.9, n=13)
Place of purchase: Morocco
Date: P 2016
Mass (g): 566
Shock stage: low
Weathering grade: moderate
Ferrosilite (mol%): 65.9; 40.7
Wollastonite (mol%): 5.4; 33.7
Classifier: A. Greshake, MNB
Type spec mass (g): 20
Type spec location: MNB
Main mass: Philippe Schmitt-Kopplin
Comments: Submitted by Ansgar Greshake