NWA 7231 (eucrite) – 13.2g


1 in stock


Nice full slice weighing 13.2g. Polished on one side. Sold with label/certificate of authenticity./

Northwest Africa 7231 (NWA 7231)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: The individuals are almost completely covered by a partly shiny black fusion crust; the interior appears dark-grayish with visible whitish plagioclase grains. It is composed of basaltic and melt clasts set into a clastic matrix of dominantly exsolved pyroxene and calcic plagioclase. Accessories include chromite, troilite, SiO2, and rare FeNi metal.

Geochemistry: opx: Fs19.8-63.9Wo2.1-6.4, FeO/MnO=27-33; cpx: Fs24.9-225.4Wo42.9-43.8, FeO/MnO=30-31; calcic plagioclase: An91.3 (range 76.7-94.7)


Place of purchase: Erfoud, Morocco
Date: P 2011
Mass (g): 191
Pieces: 8
Class: Eucrite-pmict
Shock stage: moderate
Weathering grade: moderate
Ferrosilite (mol%): 19.8-63.9; 24.9-25.4
Wollastonite (mol%): 2.1-6.4; 42.9-43.8
Classifier: A. Greshake, MNB
Type spec mass (g): 20.8
Type spec location: MNB
Main mass: Stefan Ralew
Comments: Submitted by Ansgar Greshake