Meteoritical Bulletin: Entry for Northwest Africa 6915

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Northwest Africa 6915

Basic information

Name: Northwest Africa 6915
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6915
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 89.6 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Ureilite
Recommended:			Ureilite [explanation]

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 31 Jan 2012

Writeup

Writeup from MB 100:

Northwest Africa 6915 (NWA 6915)

(Northwest Africa)

Purchased: Apr 2011

Classification: Ureilite

History: Purchased in 2011 April by Marc Jost from a Moroccan dealer visiting Switzerland.

Physical characteristics: A single black stone weighing 89.6 g.

Petrography: Fresh, coarse-grained, protogranular aggregate of olivine with dark, more reduced rims, rare grains of magnesian pigeonite and minor iron metal (only slightly stained by terrestrial weathering).

Geochemistry: Olivine cores Fa_18.8(Cr₂O₃=0.6 wt.%), rims Fa_8.1; pigeonite Fs_3.1-3.9Wo_3.8-4.2.

Classification: Achondrite (ureilite, dunitic). This specimen is very unusual among ureilites in being a dunitic rock composed almost entirely of olivine (somewhat like LEW 86216 and clasts in JaH 422).

Specimens: A total of 18.3 g of material and one polished thin section is on deposit at UWS. Mr. G. Catterton holds the main mass.

Data from:
  MB100
  Table 1
  Line 1535:

Place of purchase:	Bruegg, Switzerland
Date:	P Apr 2011
Mass (g):	89.6
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	18.8; 8.1
Ferrosilite (mol%):	3.1-3.9
Wollastonite (mol%):	3.8-4.2
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	18.3
Type spec location:	UWS
Main mass:	M. Jost
Comments:	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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

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