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Northwest Africa 8742 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8742 This is an OFFICIAL meteorite name. Abbreviation: NWA 8742 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 85 g | ||||||||||||||||||||||||
Classification history: |
This is the only approved meteorite classified as Mesosiderite-B3. Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||
Comments: | Approved 27 Feb 2015 | ||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8742 (NWA 8742) (Northwest Africa) Purchased: April 2014 Classification: Mesosiderite-B3 History: One stone found by nomads was received from Mr. Aziz Habibi in Arfoud, Morocco, in April, 2014. Physical characteristics: A single stone of 85 g total weight is a fractured fragment of meteorite. A surface of the sample is ragged, ~5% of the sample surface is covered by fusion crust Petrography: (C. A. Lorenz, Vernad.) The meteorite is a medium-grained metabreccia of silicates and Fe-Ni metal. The meteorite has poikiloblastic texture and is composed of (vol.%) 100-300 μm anhedral grains of dissolved pyroxene (65.8), 50-200 μm anhedral grains of feldspar (13.1), metal (8.0), hydroxides (13.1) and angular pyroxene megacrysts (up to 5 mm); minor minerals are a silica phase, phosphate, chromite, troilite and schreibersite. Metal is composed of kamacite and taenite. Geochemistry: (N. N. Kononkova, Vernad, EMP) pyroxene Fs28.6Wo2.8 (Fe/Mn=26.2); Fs12.8Wo42.3; feldspar An90.9Ab8.1; kamacite (wt.%) Ni =5.79, Co = 0.63, P = 0.12; taenite: Ni = 37.2-49.9, Co = 0.11-0.23. Classification: Mesosiderite-B3. Moderate weathering. Specimens: A type specimen of 27.37 g, one thin section and one polished thick section are on deposit at Vernad. DMUH holds the main mass. | ||||||||||||||||||||||||
Data from: MB104 Table 0 Line 0: |
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Institutions and collections |
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019) Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) DMUH: Dedovsk Museum of Universe History, Russia; Website (institutional address; updated 26 Sep 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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