.684 grams NWA 7831 Meteorite - Class Diogenite - as found - landed in Africa

Description

Basic information Name: Northwest Africa 7831
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7831
Observed fall: No
Year found: 2013
Country: Western Sahara
Mass: 20 kg
Classification
history:
Meteoritical Bulletin:      (2014)   Diogenite
Recommended:     Diogenite
This is 1 of 410 approved meteorites classified as Diogenite.
Northwest Africa 7831 (NWA 7831)        27.307°N, 12.083°W
Saguia el Hamra, Western Sahara
Found: 2013 Mar
Classification: HED achondrite (Diogenite)
History: Found buried in the ground near Chouichiyat on March 3, 2013, and excavated by a team of local people.
Physical characteristics: A single large mass (at least 20 kg) composed of yellow-green crystalline material with pale orange weathering products along numerous fractures. Much of the material disintegrated into fragments upon excavation.
Petrography: (A. Irving and S. Kuehner, UWS) The specimen is composed almost entirely of translucent, yellow-green orthopyroxene with very sparse, tiny included grains of Ni-free metal, troilite, chromite, anorthite, silica polymorph and clinopyroxene. Secondary pale orange, clay-like deposits from terrestrial weathering are present along thin fractures.
State/Prov/County: Saguia el Hamra
Date: 2013 Mar
Latitude: 27.307°N
Longitude: 12.083°W
Mass (g): >20000
Pieces: 1
Class: Diogenite
Shock stage: low
Weathering grade: moderate
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