54.5g Diogenite HED Meteorite fragment I NWA 7977
|Northwest Africa 7977|
Name: Northwest Africa 7977
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7977
Observed fall: No
Year found: 2013
Mass: 3.4 kg
This is 1 of 442 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
|Comments:||Approved 12 Sep 2013|
Writeup from MB 102:
Northwest Africa 7977 (NWA 7977)
Classification: HED achondrite (Diogenite)
History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to Sean Tutorow for classification, 2012.
Physical characteristics: Numerous matching fragments of the original mass, friable with coarse grained gemmy green pyroxenes, some light tan desert coating present.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 95% pyroxene, minor iron metal, chromite, troilite, and silica.
Geochemistry: (C. Agee and N. Muttik, UNM) Low Ca-pyroxene Fs28.4±0.3Wo3.5±0.7, Fe/Mn=29±1 n=14.
Classification: Achondrite (diogenite). Equilibrated, uniform pyroxene compositions.
Specimens: Two pieces, 33.75 g and 22.1 g, including a probe mount, on deposit at UNM, Sean Tutorow holds the main mass.
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