Meteoritical Bulletin: Entry for Northwest Africa 6425

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Northwest Africa 6425

Basic information

Name: Northwest Africa 6425
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6425
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 1169 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	LL3.5
Recommended:			LL3.5 [explanation]

This is 1 of 22 approved meteorites classified as LL3.5. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 6 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 6425 (NWA 6425)

Northwest Africa

Purchased: 2010 Oct

Classification: Ordinary chondrite (LL3.5)

Petrography: (A. Irving and S. Kuehner, UWS) Large (1 mm), well-formed chondrules and sparse dark inclusions (one is a stained very fine grained chondrite) in a stained matrix. Minerals are olivine, orthopyroxene, subcalcic augite, augite, sodic plagioclase, chromite, altered kamacite and troilite.

Geochemistry: Olivine (Fa_0.6-31.2, n=8. Cr₂O₃ in ferroan olivine = 0.02-0.08 wt.%, mean 0.06, s.d. 0.02, N = 6), orthopyroxene (Fs_1.8-24.7Wo_1.0-0.2), subcalcic augite (Fs_14.6Wo_28.4), augite (Fs_8.5Wo_44.2).

Classification: Ordinary chondrite (LL3.5). Subtype estimated from Cr₂O₃ distribution in ferroan olivine 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:	Morocco
Date:	P 2010 Oct
Mass (g):	1169
Pieces:	1
Class:	LL3.5
Shock stage:	S2
Weathering grade:	W1/2
Fayalite (mol%):	0.6-31.2, n=8
Ferrosilite (mol%):	1.8-24.7
Wollastonite (mol%):	1.0-0.2
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	26.9
Type spec location:	UWB
Main mass:	J. Schrader
Comments:	JS10-2; 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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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