Meteoritical Bulletin: Entry for Northwest Africa 7321

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Northwest Africa 7321

Basic information

Name: Northwest Africa 7321
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7321
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 109 g

Classification
history:

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

This is 1 of 91 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 24 Apr 2013

Writeup

Writeup from MB 102:

Northwest Africa 7321 (NWA 7321)

(Northwest Africa)

Purchased: 2012 Apr

Classification: Primitive achondrite (Acapulcoite)

History: Purchased by Stefan Ralew in April 2012 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fine grained and equigranular with abundant triple-grain junctions between silicate minerals. Minerals are orthopyroxene, olivine, clinopyroxene, sodic plagioclase, altered kamacite and troilite. Chromite appears to be absent.

Geochemistry: Orthopyroxene (Fs_11.5-11.6Wo_2.0-1.4, FeO/MnO = 12-14), olivine (Fa_12.3-13.1, FeO/MnO = 19-20), clinopyroxene (Fs_4.3-5.2Wo_45.3-43.8, FeO/MnO = 9).

Classification: Acapulcoite

Specimens: 20.85 g of sample and one polished thin section are on deposit at UWB. S. Ralew holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2012 Apr
Mass (g):	109
Pieces:	1
Class:	Acapulcoite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	12.3-13.1
Ferrosilite (mol%):	11.5-11.6; 4.3-5.2
Wollastonite (mol%):	2.0-1.4; 45.3-43.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.85
Type spec location:	UWB
Main mass:	S. Ralew
Comments:	RA12-20; 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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

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)
bphd

Geography:

Coordinates:

Unknown.

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

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