Meteoritical Bulletin: Entry for Northwest Africa 6722

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Northwest Africa 6722

Basic information

Name: Northwest Africa 6722
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6722
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 443 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	L3.5
Recommended:			L3.5 [explanation]

This is 1 of 95 approved meteorites classified as L3.5. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 6 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 6722 (NWA 6722)

Northwest Africa

Purchased: 2011 Feb

Classification: Ordinary chondrite (L3.5)

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, medium-sized (some to 0.7 mm) chondrules in a matrix containing stained metal. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite, Ni-bearing troilite and pentlandite.

Geochemistry: Olivine (Fa_13.7-36.8; Cr₂O₃ for ferroan olivine grains = 0.05 to 0.10 wt.%, mean 0.07, s.d. 0.02, N = 7), orthopyroxene (Fs_2.3-6.9Wo_0.4-0.7), clinopyroxene (Fs_3.1-6.5Wo_35.1-27.1).

Classification: Ordinary chondrite (L3.5). Subtype estimated to be 3.5 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:	Marrakech
Date:	P 2011 Feb
Mass (g):	442.6
Pieces:	1
Class:	L3.5
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	13.7-36.8, n=9
Ferrosilite (mol%):	2.3-6.9
Wollastonite (mol%):	0.4-0.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	B. Booz
Comments:	BB-35; 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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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Beat Booz

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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