Meteoritical Bulletin: Entry for Northwest Africa 6924

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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: 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

Writeup

help

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 (Fa_9.6-43.7; Cr₂O₃ in ferroan examples is 0.02-0.21 wt.%, mean 0.06 wt.%, s.d. 0.08 wt.%, N =7), orthopyroxene (Fs_3.1-23.5Wo_0.2-0.5), clinopyroxene (Fs_8.1-10.1Wo_44.6-45.0).

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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