Meteoritical Bulletin: Entry for Northwest Africa 7316

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Northwest Africa 7316

Basic information

Name: Northwest Africa 7316
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7316
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 153 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	H5
Recommended:			H5 [explanation]

This is 1 of 11150 approved meteorites (plus 22 unapproved names) classified as H5. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 22 Oct 2013

Writeup

Writeup from MB 102:

Northwest Africa 7316 (NWA 7316)

(Northwest Africa)

Purchased: 2012 Apr

Classification: Ordinary chondrite (H5)

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

Petrography: (A. Irving and S. Kuehner, UWS) Largely recrystallized, but with sparse, medium-sized (to 0.7 mm) chondrules and partial chondrules. There is a moderate content of fairly fresh metal grains, but also some thin cross-cutting, orange iron hydroxide veinlets.

Geochemistry: Olivine (Fa_21.5-21.8) with FeO/MnO=43, orthopyroxene (Fs_17.8-18.8Wo_0.4-1.3) with FeO/MnO=23-27, clinopyroxene (Fs_15.6Wo_13.2).

Classification: Ordinary chondrite (H5). May be transitional H/L5 based on the olivine and pyroxene compositions, including their FeO/MnO ratios, being intermediate between those established for equilibrated H and L chondrites.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2012 Apr
Mass (g):	153
Pieces:	1
Class:	H5
Shock stage:	S2
Weathering grade:	W1/2
Fayalite (mol%):	21.5-21.8 (n=5)
Ferrosilite (mol%):	17.8-18.8
Wollastonite (mol%):	0.4-1.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	23.3
Type spec location:	UWB
Main mass:	F. Kuntz
Comments:	K187; 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)
Kuntz: Fabien Kuntz, France; 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)
Michael S. Scherman
The Wilcox Collection of Meteorites

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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