Meteoritical Bulletin: Entry for Northwest Africa 657

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Northwest Africa 657

Basic information

Name: Northwest Africa 657
This is an OFFICIAL meteorite name.
Abbreviation: NWA 657
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass: 1450 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	L5
Recommended:			L5 [explanation]

This is 1 of 8890 approved meteorites (plus 5 unapproved names) classified as L5. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 17 Dec 2016

Writeup

Writeup from MB 105:

Northwest Africa 657 (NWA 657)

(Northwest Africa)

Purchased: 2000 Nov

Classification: Ordinary chondrite (L5)

History: Purchased by Michael Cottingham in November 2000 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Sparse chondrules occur in a recrystallized matrix containing stained metal.

Geochemistry: Olivine (Fa_25.0-25.9, N = 3), orthopyroxene (Fs_21.1-21.4Wo_1.8-1.6, N = 3), clinopyroxene (Fs_7.2-8.1Wo_45.7-43.9, N = 2).

Classification: Ordinary chondrite (L6).

Specimens: 21.7 g including one polished thin section at PSF; remainder is held by Cott.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2000 Nov
Mass (g):	1450
Pieces:	1
Class:	L5
Shock stage:	S2
Weathering grade:	W1/2
Fayalite (mol%):	25.0-25.9
Ferrosilite (mol%):	21.2-21.4
Wollastonite (mol%):	1.8-1.6
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	21.7
Type spec location:	PSF
Main mass:	M. Cottingham
Comments:	C113; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Cott: Michael Cottingham Meteorite Collection, P.O. Box 727, Silver City, NM 88062, United States (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
André Knöfel
Gerald Armstrong
Jean-Michel Masson
John A. Shea
Ryan Upchurch
Stefano De Fazi

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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