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Northwest Africa 10931 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 10931 This is an OFFICIAL meteorite name. Abbreviation: NWA 10931 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 15 approved meteorites classified as CO3.1. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 10 Dec 2016 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 105:
Northwest Africa 10931 (NWA 10931) (Northwest Africa) Purchased: 2013 Classification: Carbonaceous chondrite (CO3.1) History: Purchased by Aziz Habibi in Gulomim from a nomad. Physical characteristics: Smooth fusion crust exterior with numerous sub-millimeter chondrule outlines. A saw cut reveals many very small chondrules and a few small CAIs set in a dark-brown matrix. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous chondrules, many fragmental or irregular, most in the size range 50-200 μm. Scattered matrix olivines and CAIs were observed throughout. Fine grained matrix makes up approximately 50% of this meteorite. Geochemistry: (C. Agee and N. Muttik, UNM) All olivine Fa25.7±18.2, Fe/Mn=98±41, n=38; ferroan chondrule olivine Fa28.5±17.0, Fe/Mn=105±37, Cr2O3=0.14±0.15 (wt%), n=34; enstatite Fs4.5±3.9Wo2.4±1.5, n=10; diopside Fs3.1±3.8Wo38.6±8.6, n=6 Classification: Carbonaceous chondrite (CO3.1), type 3.1 based on mean value and sigma of Cr2O3 in ferroan olivine (Grossman and Brearley, 2005), the values are midway between Colony (CO3.0) and Rainbow (CO3.2). Specimens: 25.0 g including a probe mount on deposit at UNM, Aziz Habibi holds the main mass. | ||||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB105 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography: |
Statistics: This is 1 of 7552 approved meteorites from (Northwest Africa) (plus 1969 unapproved names) |