Meteoritical Bulletin: Entry for Northwest Africa 12629

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Northwest Africa 12629

Basic information

Name: Northwest Africa 12629
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12629
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 3.9 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	L4
Recommended:			L4 [explanation]

This is 1 of 1930 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 11 May 2019

Writeup

Writeup from MB 108:

Northwest Africa 12629 (NWA 12629)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Ordinary chondrite (L4)

History: Purchased in Zouerat, Mauritania by Mbark Arjdal in July 2018 from Mohamed Zergou.

Physical characteristics: A single, rather fragile stone with a somewhat weathered exterior (3897 g). Fresh interior surfaces exhibit well-formed chondrules in a finer matrix.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Closely-packed, well-formed chondrules are set in a sparse matrix containing altered metal.

Geochemistry: Olivine, Fa_25.0±0.1(Fa_24.9-25.0), N = 3; low-Ca pyroxene, Fs_22.9±3.6Wo_1.2±1.1(Fs_20.4-29.5Wo_0.5-2.8), N = 3; subcalcic augite, Fs_15.3Wo_2.5; augite, Fs_10.4Wo_35.1.

Classification: Ordinary chondrite (L4).

Specimens: 71.9 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Zouerat, Mauritania
Date:	P 2018 Jul
Mass (g):	3897
Pieces:	1
Class:	L4
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	25.0±0.1 (n=3)
Ferrosilite (mol%):	22.9±3.6 (n=3)
Wollastonite (mol%):	1.2±1.1
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	71.9
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj A3KG; 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)

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 8420 approved meteorites from (Northwest Africa) (plus 1900 unapproved names)

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