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Northwest Africa 6924
Basic information Name: Northwest Africa 6924
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6924
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 290 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL3.4
Recommended:  LL3.4    [explanation]

This is 1 of 24 approved meteorites classified as LL3.4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 6 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 6924 (NWA 6924)

Northwest Africa

Purchased: 2011 Feb

Classification: Ordinary chondrite (LL3.4)

Petrography: (A. Irving and S. Kuehner, UWS) The majority of clasts are unequilibrated and contain large (to ~ 1mm), well-formed chondrules (which also are present as individual objects in the matrix). Several more equilibrated clasts were also observed (one Type 5 chondrite and one with completely recrystallized texture). Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, altered kamacite, chromite, troilite and taenite.

Geochemistry: Olivine (Fa9.6-43.7; Cr2O3 in ferroan examples is 0.02-0.21 wt.%, mean 0.06 wt.%, s.d. 0.08 wt.%, N =7), orthopyroxene (Fs3.1-23.5Wo0.2-0.5), clinopyroxene (Fs8.1-10.1Wo44.6-45.0).

Classification: Ordinary chondrite (LL3.4). Subtype of the unequilibrated clasts estimated to be 3.4 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:Agadir
Date:P 2011 Feb
Mass (g):290
Pieces:1
Class:LL3.4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):9.6-43.7, n=9
Ferrosilite (mol%):3.1-23.5
Wollastonite (mol%):0.2-0.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.6
Type spec location:UWB
Main mass:G. Fujihara
Comments:GF11-3; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6752 approved meteorites from (Northwest Africa) (plus 2052 unapproved names)

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