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Northwest Africa 12631
Basic information Name: Northwest Africa 12631
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12631
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 173.8 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 504 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 11 Jun 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12631 (NWA 12631)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Ureilite

History: Purchased in February 2019 by Darryl Pitt from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular aggregate (mean grain size 0.6 mm) of olivine (~80 vol.%) and pigeonite (~20 vol.%) with minor accessory Cr-troilite and pentlandite. Olivine grains have narrow reduced magnesian rims associated with Fe metal blebs. No graphite was observed.

Geochemistry: Olivine (cores Fa20.3-20.6; rims Fa11.7-15.5; N = 7), pigeonite (Fs17.2-17.5Wo7.5-7.2, N = 3).

Classification: Ureilite.

Specimens: 21.4 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):173.8
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:low
Fayalite (mol%):20.3-20.6
Ferrosilite (mol%):17.2-17.5
Wollastonite (mol%):7.5-7.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.4
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 459; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6846 approved meteorites from (Northwest Africa) (plus 2038 unapproved names)

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