Meteoritical Bulletin: Entry for Northwest Africa 6910

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Northwest Africa 6910

Basic information

Name: Northwest Africa 6910
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6910
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass: 390 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	L3.3
Recommended:			L3.3 [explanation]

This is 1 of 18 approved meteorites classified as L3.3. [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 6910 (NWA 6910)

Northwest Africa

Purchased: 2009 Sep

Classification: Ordinary chondrite (L3.3)

Petrography: (A. Irving and S. Kuehner, UWS) Well formed, fairly large (to 0.7 mm) closely packed chondrules in a very dark matrix containing a moderate amount of metal. Minerals are olivine, orthopyroxene, augite, subcalcic augite, sodic plagioclase, chromite, partly altered kamacite, troilite and taenite.

Geochemistry: Olivine (Fa_0.4-39.2; Cr₂O₃ in ferroan olivine = 0.02-0.33 wt.%, mean 0.12 wt.%, s.d. 0.12, N = 9), orthopyroxene (Fs_1.2-7.4Wo_0.5-0.6), augite (Fs_6.4Wo_36.1), subcalcic augite (Fs_21.0Wo_29.5). log χ (× 10^-9 m³/kg) = 4.93.

Classification: Ordinary chondrite (L3.3). Subtype estimated to be 3.3 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:	Denver
Date:	P 2009 Sep
Mass (g):	390
Pieces:	1
Class:	L3.3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	0.4-39.2, n=11
Ferrosilite (mol%):	1.2-7.4
Wollastonite (mol%):	0.5-0.6
Magnetic suscept.:	4.93
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	21
Type spec location:	UWB
Main mass:	E. Twelker
Comments:	ET-M09; 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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)

Catalogs:

References:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

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

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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