Eucrite - NWA 12929 pairing

Eucrite - NWA 12929 pairing

Northwest Africa 12929 (NWA 12929)

Classification: HED achondrite (Eucrite, monomict)

History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer.

Physical characteristics: Many identically appearing pieces, desert weathered exterior, broken surface reveals a dark, fine grained interior.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows mild brecciation with approximately 60% pyroxene and 35% plagioclase. Many pyroxenes have exsolution lamellae. Minor silica and troilite observed. Shock melt veins are present.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.6±1.8Wo3.3±2.4, Fe/Mn=32±0, n=9; high-Ca pyroxene Fs36.7±9.5Wo33.4±10.9, Fe/Mn=31±0, n=4; plagioclase An89.4±3.1, n=7.

Classification: Monomict basaltic eucrite, equilibrated.

Place of discovery: North-west Africa

Date of discovery: 2016

Mass (g): 23700

Pieces: Many

Class: Eucrite-mmict

Shock stage: high

Weathering grade: moderate

Classifier: C. Agee, UNM

Main mass: Dustin Dickens


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