Meteoritical Bulletin: Entry for Northwest Africa 6913

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Northwest Africa 6913

Basic information

Name: Northwest Africa 6913
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6913
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 36 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 29 Nov 2011

Writeup

Writeup from MB 100:

Northwest Africa 6913 (NWA 6913)

Northwest Africa

Purchased: Feb 2011

Classification: HED achondrite (Eucrite, polymict)

Petrography: Fragmental breccia composed mostly of clasts and debris of various textural types of eucrites (cumulate, ophitic, granulitic, vitrophyric and very fine grained quenched). These lithologies are composed of low-Ca pyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite and rare Ni-free metal. Rare components include a zoned olivine grain, a ferroan subcalcic augite grain, diogenitic orthopyroxene grains, and one finer grained breccia clast.

Geochemistry: Diogenitic orthopyroxene Fs_22.2Wo_3.3, FeO/MnO=30, pigeonite Fs_56.9Wo_7.2, FeO/MnO=31, subcalcic augite Fs_60.5Wo_26.9, FeO/MnO=34, olivine core Fa_20.8, rim Fa_38.4, FeO/MnO=41-60.

Data from:
  MB100
  Table 1
  Line 1533:

Place of purchase:	Tucson
Date:	P Feb 2011
Mass (g):	35.96
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	20.8
Ferrosilite (mol%):	22.2; 56.9
Wollastonite (mol%):	3.3; 7.2
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	7.2
Type spec location:	UWS
Main mass:	MMartin
Comments:	MM11-3; 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)
MMartin: P.O. Box 164, Kaaawa, HI 96730, United States; Website (private address; updated 14 Jul 2013)

Catalogs:

References:

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

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)
Andreas Grünemeyer

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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