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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:help 1450 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  L5
Recommended:  L5    [explanation]

This is 1 of 6528 approved meteorites (plus 4 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
Writeuphelp
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 (Fa25.0-25.9, N = 3), orthopyroxene (Fs21.1-21.4Wo1.8-1.6, N = 3), clinopyroxene (Fs7.2-8.1Wo45.7-43.9, 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:
CreditPhotos
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   
Stefano De Fazi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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