Meteoritical Bulletin: Entry for Northwest Africa 11852

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Northwest Africa 11852

Basic information

Name: Northwest Africa 11852
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11852
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 45 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	LL7
Recommended:			LL7 [explanation]

This is 1 of 89 approved meteorites classified as LL7. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 4 Jul 2018

Writeup

Writeup from MB 107:

Northwest Africa 11852 (NWA 11852)

(Northwest Africa)

Purchased: 2018 Feb

Classification: Ordinary chondrite (LL7)

History: Purchased by Fred Olsen in February 2018 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Triple grain junction texture with no chondrules or chondrule remnants. Relatively fine grained aggregate (mean grainsize ~150 µm ) of olivine, orthopyroxene, clinopyroxene, sodic plagioclase, chromite, chlorapatite, taenite and troilite.

Geochemistry: Olivine (Fa_29.6-29.8, N = 3), orthopyroxene (Fs_23.7-23.8Wo_1.7-2.0, N = 3), clinopyroxene (Fs_10.0-10.4Wo_43.2-42.1, N = 2).

Classification: Ordinary chondrite (LL7).

Specimens: 9.2 g including one polished thin section at UWB; remainder with Mr. F. Olsen.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2018 Feb
Mass (g):	45
Pieces:	1
Class:	LL7
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	29.6-29.8
Ferrosilite (mol%):	23.7-23.8
Wollastonite (mol%):	1.7-2.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	9.2
Type spec location:	UWB
Main mass:	F. Olsen
Comments:	Work name FO18-1; 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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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