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| Northwest Africa 7831 | |||||||||||||||||||||||||||||||
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| 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: |
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| Comments: | Approved 6 Sep 2014 | ||||||||||||||||||||||||||||||
| Writeup | Writeup from MB 103: 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. Geochemistry: Orthopyroxene (Fs28.1-28.3Wo3.0-3.3; FeO/MnO = 29-31), clinopyroxene (Fs10.9Wo43.1, FeO/MnO = 26). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed orthopyroxene by laser fluorination gave, respectively, δ17O = 1.677, 1.793, 1.810; δ18O = 3.680, 3.879, 3.875; Δ17O = -0.266, -0.255, -0.236 per mil. Specimens: 44.5 g of material is on deposit at UWB. The remainder is held by several anonymous collectors. | ||||||||||||||||||||||||||||||
| Data from: MB103 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||