Meteoritical Bulletin: Entry for Northwest Africa 12631

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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: 173.8 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Ureilite
Recommended:			Ureilite [explanation]

This is 1 of 604 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 11 Jun 2019

Writeup

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 Fa_20.3-20.6; rims Fa_11.7-15.5; N = 7), pigeonite (Fs_17.2-17.5Wo_7.5-7.2, 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 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8402 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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