Meteoritical Bulletin: Entry for Northwest Africa 7638

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Northwest Africa 7638

Basic information

Name: Northwest Africa 7638
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7638
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 62.8 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	L4
Recommended:			L4 [explanation]

This is 1 of 2062 approved meteorites (plus 5 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 26 Feb 2013

Writeup

Writeup from MB 102:

Northwest Africa 7638 (NWA 7638)

(Northwest Africa)

Purchased: 2006 Feb

Classification: Ordinary chondrite (L4)

History: Purchased by Philip Mani in February 2006 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving & S. Kuehner, UWS) Very fresh specimen composed of well-formed chondrules in a matrix containing sporadic primary voids (inside which chondrule outlines are visible). Minerals are olivine, orthopyroxene, pigeonite, chlorapatite, fresh kamacite and troilite. No plagioclase was found, but there is abundant alkali-rich glass.

Geochemistry: Olivine (Fa_23.0-24.2), orthopyroxene (Fs_19.3-19.4Wo_1.5; some cores Fs_9.5Wo_0.7), subcalcic augite (Fs_11.7-12.8Wo_34.9-33.1).

Classification: Ordinary chondrite (L4).

Specimens: Type sample and polished thin section at UWB. Main mass with P. Mani.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2006 Feb
Mass (g):	62.8
Pieces:	1
Class:	L4
Shock stage:	S2
Weathering grade:	W0
Fayalite (mol%):	23.0-24.2
Ferrosilite (mol%):	19.3-19.4
Wollastonite (mol%):	1.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	15.8
Type spec location:	UWB
Main mass:	P. Mani
Comments:	PCM12-30; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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