Meteoritical Bulletin: Entry for Northwest Africa 6867

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Northwest Africa 6867

Basic information

Name: Northwest Africa 6867
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6867
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 325 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	LL3
Recommended:			LL3 [explanation]

This is 1 of 444 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 22 Oct 2013

Writeup

Writeup from MB 102:

Northwest Africa 6867 (NWA 6867)

(Northwest Africa)

Purchased: 2011 Apr

Classification: Ordinary chondrite (LL3)

Petrography: (A. Irving and S. Kuehner, UWS) Unequilibrated specimen composed of relatively large (to 1 mm), well-formed chondrules in a fairly weathered matrix. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa_1.4-35.0; Cr₂O₃ in ferroan olivine 0.14-0.80 wt.%, mean 0.38 wt.%, s.d. 0.23 wt.%, N = 8), orthopyroxene (Fs_2.6-24.1Wo_0.2-1.5), clinopyroxene (Fs_3.3-10.4Wo_43.7-37.8). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ¹⁸O 5.764, 5.547; δ¹⁷O 3.618, 3.459; Δ¹⁷O 0.582, 0.537 per mil.

Classification: Chondrite (LL3.1). Subtype estimated to be 3.1 based on Cr₂O₃ range in ferroan olivine. Estimation of subtype based on chart (Fig. 15) 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:	Ouarzazate
Date:	P 2011 Apr
Mass (g):	325
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	1.4-35.0 (n=10)
Ferrosilite (mol%):	2.6-24.1
Wollastonite (mol%):	0.2-1.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22
Type spec location:	UWB
Main mass:	J. Schrader
Comments:	JS11-1; submitted by A. Irving

Plots:

O isotopes:

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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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