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Northwest Africa 12197
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:help 487 g
Meteoritical Bulletin:  MB 107  (2018)  CR2
Recommended:  CR2    [explanation]

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 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:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P May 2018
Mass (g):487
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):3.3±3.3
Ferrosilite (mol%):1.3±0.4
Wollastonite (mol%):1.9±1.3
Classifier:C. Agee, UNM
Type spec mass (g):22.3
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH-358; submitted by C. Agee, UNM
   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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Western Sahara

     This is 1 of 263 approved meteorites from Western Sahara (plus 19 unapproved names)

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