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. As members of the IMCA (International Association of Meteorite Collectors), we guarantee the authenticity of all our pieces. (The certificate of authenticity will be delivered with the Meteorite)