Meteoritical Bulletin: Entry for Northwest Africa 6726

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Northwest Africa 6726

Basic information

Name: Northwest Africa 6726
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6726
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 1836 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	CO3
Recommended:			CO3 [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 6 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 6726 (NWA 6726)

Northwest Africa

Purchased: 2011 Jan

Classification: Carbonaceous chondrite (CO3)

Petrography: (A. Irving and S. Kuehner, UWS) Small (typically <0.3 mm) chondrules are set within a relatively unaltered matrix containing taenite, troilite and rare kamacite.

Geochemistry: Olivine (Fa_0.5-39.1; Cr₂O₃ in ferroan olivine 0.10-0.35 wt.%, mean 0.19, s.d. 0.12, N = 9), orthopyroxene (Fs_3.1-9.1Wo_1.1-2.8), clinopyroxene (Fs_1.1-2.8Wo_37.3-38.6).

Classification: Carbonaceous chondrite (CO3.2). Subtype estimated to be 3.2 based on Cr₂O₃ range in ferroan olivine. Estimation of subtype based on histograms (Fig. 5) 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:	Erfoud
Date:	P 2011 Jan
Mass (g):	1836
Pieces:	1
Class:	CO3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	0.5-39.1, n=11
Ferrosilite (mol%):	3.1-9.1
Wollastonite (mol%):	1.1-2.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20
Type spec location:	UWB
Main mass:	M. Cimala
Comments:	MC089; 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 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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