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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:help 88 g
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 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 (Fa5.5-33.2; Cr2O3 in ferroan olivine = 0.02-0.06 wt.%, mean 0.04, s.d. 0.01, N = 5), orthopyroxene (Fs7.2-26.2Wo0.1-1.0), pigeonite (Fs20.6Wo6.2; Fs14.1Wo17.3).

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).

  • 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:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2011 May
Mass (g):88
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
   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)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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