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Northwest Africa 4557
Basic information Name: Northwest Africa 4557
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4557
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 250 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  L4
Recommended:  L4    [explanation]

This is 1 of 1751 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 24 Jul 2007
Data from:
  MB92
  Table 2
  Line 101:
Place of purchase:Erfoud, Morocco
Date:2006
Mass (g):250
Pieces:1
Class:L4
Shock stage:S3-5
Weathering grade:W1
Fayalite (mol%):23
Ferrosilite (mol%):19.8
Wollastonite (mol%):2.4
Classifier:T. Bunch, NAU
Type spec mass (g):18.7
Type spec location:NAU
Main mass:Cimala
Comments:Shock darkened
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Polandmet   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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