Meteoritical Bulletin: Entry for Northwest Africa 7005

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Northwest Africa 7005

Basic information

Name: Northwest Africa 7005
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7005
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 225 g

Classification
history:

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

This is 1 of 639 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

help

Writeup from MB 102:

Northwest Africa 7005 (NWA 7005)

Northwest Africa

Purchased: 2011 Sep

Classification: Carbonaceous chondrite (CO3)

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed small (to 0.3 mm) chondrules. Olivine, orthopyroxene, with accessory clinopyroxene, calcic plagioclase, troilite, pentlandite, taenite and altered kamacite. Some rounded composite metal+sulfide aggregates. Sparse small CAI composed of fine grained spinel, with varying amounts of Mg-ilmenite, grossite and corundum; some CAI have Wark-Lovering rims composed of sodalite and wollastonite.

Geochemistry: Olivine (Fa_0.9-37.5; Cr₂O₃ in ferroan olivine 0.02-0.06 wt.%, mean 0.04, s.d. 0.02, N = 5), orthopyroxene (Fs_1.2-9.0Wo_0.8-2.9), clinopyroxene (Fs_1.3Wo_39.0; Fs_18.1-18.4Wo_46.3-47.5).

Classification: Carbonaceous chondrite (CO3.6). Subtype estimated to be 3.6 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:	Taliouine
Date:	P 2011 Sep
Mass (g):	225
Pieces:	1
Class:	CO3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	0.9-37.5, n=7
Ferrosilite (mol%):	1.2-9.0
Wollastonite (mol%):	0.8-2.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	28.1
Type spec location:	UWB
Main mass:	J. Higgins
Comments:	JH11-6; 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)
Aeroliths Collection Theodossiou

Geography:

Coordinates:

Unknown.

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

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