Meteoritical Bulletin: Entry for Northwest Africa 7122

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Northwest Africa 7122

Basic information

Name: Northwest Africa 7122
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7122
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 2.38 kg

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	L4
Recommended:			L4 [explanation]

This is 1 of 2027 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 21 Feb 2012

Writeup

Writeup from MB 100:

Northwest Africa 7122 (NWA 7122)

(Northwest Africa)

Purchased: Oct 2011

Classification: Ordinary chondrite (L4)

Petrography: Well-developed, medium-sized chondrules. The constituent minerals are mostly equilibrated, but orthopyroxene grains contain remnant, more magnesian cores. Minerals are olivine, orthopyroxene, pigeonite, subcalcic augite, sodic plagioclase, chromite, troilite and altered kamacite.

Geochemistry: Olivine (Fa_26.4-26.5), orthopyroxene (Fs_9.2-20.2Wo_1.2-1.1), pigeonite (Fs_8.6Wo_8.5), subcalcic augite (Fs_12.2Wo_33.6).

Data from:
  MB100
  Table 1
  Line 1646:

Place of purchase:	Taliouine
Date:	P Oct 2011
Mass (g):	2377
Pieces:	2
Class:	L4
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	26.4-26.5
Ferrosilite (mol%):	20.2
Wollastonite (mol%):	1.1
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	43
Type spec location:	UWS
Main mass:	J. Higgins
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)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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