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Northwest Africa 12698
Basic information Name: Northwest Africa 12698
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12698
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1178 g
Meteoritical Bulletin:  MB 108  (2020)  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 4 Jul 2019
Writeup from MB 108:

Northwest Africa 12698 (NWA 12698)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CR2)

History: Found in the Arg-Shash region located at the Mauritanian-Algerian border by desert nomads in spring 2018.

Physical characteristics: Single stone, ~90% fusion encrusted trapezoidal-shaped stone; saw cut reveals numerous chondrules up to 2 mm in diameter and scattered CAIs. 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; often decorated or mantled with metal. Abundant fine grained, hydrous matrix throughout. Aluminous diopside detected.

Geochemistry: (C. Agee, UNM) Forsterite Fa2.4±2.3, Fe/Mn=27±19, Cr2O3=0.29±0.12 wt%, n=12; enstatite Fs1.7±1.3Wo1.7±1.2, Fe/Mn=12±10, n=12.

Classification: Carbonaceous chondrite (CR2), possibly paired with NWA 12197.

Specimens: 20.1 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018
Mass (g):1178
Shock stage:low
Weathering grade:low
Fayalite (mol%):2.4±2.3
Ferrosilite (mol%):1.7±1.3 (n=22)
Wollastonite (mol%):1.7±1.2
Classifier:C. Agee, UNM
Type spec mass (g):20.1
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH-433; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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