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Northwest Africa 10891 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 10891 This is an OFFICIAL meteorite name. Abbreviation: NWA 10891 Observed fall: No Year found: 2016 Country: Mauritania Mass: 482 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 15 approved meteorites classified as CO3.2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 18 Nov 2016 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 105:
Northwest Africa 10891 (NWA 10891) Mauritania Purchased: April 2016 Classification: Carbonaceous chondrite (CO3.2) History: Found by meteorite hunters during an expedition near the Western Saharan, Algerian and Mauritanian border region. Purchased in Mauritania. Physical characteristics: Single stone. Weathered fusion crust exterior. 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 40% of this meteorite. Geochemistry: (C. Agee and M. Spilde, UNM) All olivine Fa15.8±15.5, n=19; coarse ferroan olivine Fa19.7±15.2, Fe/Mn=90±39, Cr2O3=0.09±0.09 (wt%), n=15; enstatite Fs1.9±1.3Wo2.0±1.4, n=8; diopside Fs4.1±0.1Wo38.1±6.6, n=2. Classification: Carbonaceous chondrite (CO3.2), type 3.2 based on mean value and sigma of Cr2O3 in ferroan olivine (Grossman and Brearley, 2005), the values are similar to Rainbow (CO3.2). Specimens: 20.6 g including a probe mount on deposit at UNM. DPitt 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) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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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 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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