Meteoritical Bulletin: Entry for Northwest Africa 6422

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Northwest Africa 6422

Basic information

Name: Northwest Africa 6422
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6422
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 310 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	L3.6
Recommended:			L3.6 [explanation]

This is 1 of 59 approved meteorites classified as L3.6. [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 6422 (NWA 6422)

Northwest Africa

Purchased: 2010 Sep

Classification: Ordinary chondrite (L3.6)

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed barred olivine, porphyritic olivine and radial pyroxene chondrules. Minerals are olivine, orthopyroxene, clinopyroxene, partially altered kamacite, chromite, troilite and taenite.

Geochemistry: Olivine (Fa_2.1-41.6; Cr₂O₃ in ferroan olivines = 0.02-0.06 wt.%, mean 0.05, s.d. 0.02, N = 6), orthopyroxene (Fs_3.5-23.7Wo_0.5-1.3), clinopyroxene (Fs_4.9Wo_45.8; Fs_18.8Wo_39.4).

Classification: Ordinary chondrite (L3.6). Subtype estimated to be 3.6 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:	Erfoud
Date:	P 2010 Sep
Mass (g):	310
Pieces:	1
Class:	L3.6
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	2.1-41.6, n=8
Ferrosilite (mol%):	3.5-23.7
Wollastonite (mol%):	0.5-1.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20
Type spec location:	UWB
Main mass:	G. Fujihara
Comments:	GF10-5; 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)
Jean-Michel Masson

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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