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Northwest Africa 12197 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12197 This is an OFFICIAL meteorite name. Abbreviation: NWA 12197 Observed fall: No Year found: 2018 Country: Western Sahara Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 183 approved meteorites classified as CR2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 9 Nov 2018 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Northwest Africa 12197 (NWA 12197) Western Sahara Purchased: May 2018 Classification: Carbonaceous chondrite (CR2) History: Found near the Algerian-Western Sahara border region, March 2018. Purchased by Darryl Pitt in Mauritania, May 2018. Physical characteristics: Single stone, weathered exterior. A saw cut reveals numerous chondrules up to 1 mm in diameter many with irregular or decorated rims, and sparse CAIs, but one observed was ~5 mm in size. Dark, gray-colored groundmass makes up about 30% of this meteorite, ubiquitous opaques visible. Petrography: (C. Agee, UNM) Microprobe examination showed many porphyritic chondrules most of which were type I. Many chondrules are metal-rich. Abundant fine grained, hydrous matrix throughout. Geochemistry: (C. Agee, UNM) Olivine Fa3.3±3.3, Cr2O3=0.20±0.11 (wt%), n=21; pyroxene Fs1.3±0.4Wo1.9±1.3, n=10. Classification: Carbonaceous chondrite (CR2) Specimens: 22.3 g on deposit at UNM, DPitt holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB107 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. 107, MAPS 55, 460-462
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Geography:![]() |
Statistics: This is 1 of 263 approved meteorites from Western Sahara (plus 19 unapproved names) |