Northwest Africa 2286 2.7g

Northwest Africa

Purchased 2003

Achondrite (olivine-rich diogenite)

A single stone of 82 g was found 2003 by an anonymous finder in the Occidental Sahara and purchased in 2003 in Morocco. Classification and mineralogy (A. Greshake, MNB): is dominated by large blocky orthopyroxene crystals and ~20% large olivine phenocrysts; minor phases include FeS, and Fe-Al-Cr-spinel; orthopyroxene, Fs21.9Wo1.5, olivine, Fa26.8; low degree of shock; moderately to strongly weathered and very friable; most likely paired with NWA 1877. Specimens: main mass with anonymous finder; type specimen 23.5 g plus one polished thin section MNB.

Origin or pseudonym: Morocco
Date: 2003
Mass (g): 82
Pieces: 1
Class: Dio
Weathering grade: moderate
Fayalite (mol%): 26.8
Ferrosilite (mol%): 21.9
Classifier: A. Greshake, MNB
Type spec mass (g): 23.5
Main mass: Peter Marmet, Bern, Switzerland
Comments: see separate entry




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