Meteoritical Bulletin: Entry for Northwest Africa 6922

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Northwest Africa 6922

Basic information

Name: Northwest Africa 6922
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6922
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 88 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	LL3.6
Recommended:			LL3.6 [explanation]

This is 1 of 21 approved meteorites classified as LL3.6. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 6 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 6922 (NWA 6922)

Northwest Africa

Purchased: 2011 May

Classification: Ordinary chondrite (LL3.6)

Petrography: (A. Irving and S. Kuehner, UWS) Relatively large (<1 mm), well-formed PO and RP chondrules in a fragmental matrix containing low amounts of altered metal. Minerals are olivine, orthopyroxene, pigeonite, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa_5.5-33.2; Cr₂O₃ in ferroan olivine = 0.02-0.06 wt.%, mean 0.04, s.d. 0.01, N = 5), orthopyroxene (Fs_7.2-26.2Wo_0.1-1.0), pigeonite (Fs_20.6Wo_6.2; Fs_14.1Wo_17.3).

Classification: Ordinary chondrite (LL3.6). Subtype estimated to be 3.6 based on Cr₂O₃ range in ferroan olivine. Estimation of subtype based on histograms (Fig. 4) in Grossman and Brearley (2005).

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2011 May
Mass (g):	88
Pieces:	1
Class:	LL3.6
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	5.5-33.2, n=7
Ferrosilite (mol%):	7.2-26.2
Wollastonite (mol%):	0.1-1.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	17.8
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	M1243; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

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 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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