Meteoritical Bulletin: Entry for Northwest Africa 8131

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Northwest Africa 8131

Basic information

Name: Northwest Africa 8131
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8131
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 39.8 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	CO3
Recommended:			CO3 [explanation]

This is 1 of 553 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 27 Jan 2015

Writeup

Writeup from MB 104:

Northwest Africa 8131 (NWA 8131)

(Northwest Africa)

Purchased: 2013 Sep

Classification: Carbonaceous chondrite (CO3)

History: Purchased by S. Vasiliev in September 2013 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fairly abundant, small chondrules together with mineral fragments and fine-grained CAI occur in a brown, fine-grained matrix. Minerals are olivine, orthopyroxene, clinopyroxene, Ni-poor kamacite, rare kirschsteinite and minor barite. No sulfides were detected.

Geochemistry: Olivine (Fa_0.8-75.5; Cr₂O₃ in ferroan examples is 0.14-0.29 wt.%, mean 0.17 wt.%, s.d. 0.06 wt.%, N = 9), orthopyroxene (Fs_0.9-39.0Wo_1.0-0.9, N = 3), clinopyroxene (Fs_0.9Wo_41.8).

Classification: Carbonaceous chondrite (CO3).

Specimens: 8.4 g including one polished thin section at UWB. The remaining material is held by S. Vasiliev.

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2013 Sep
Mass (g):	39.8
Pieces:	1
Class:	CO3
Shock stage:	S2
Weathering grade:	moderate
Fayalite (mol%):	0.8-75.5
Ferrosilite (mol%):	0.9-39.0
Wollastonite (mol%):	1.0-0.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	8.4
Type spec location:	UWB
Main mass:	S. Vasiliev
Comments:	SV15; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Cosimo Damiano Gorgoglione
John A. Shea
Piotr gural100
Predrag Radovic

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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