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Northwest Africa 7157
Basic information Name: Northwest Africa 7157
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7157
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 120 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  L7
Recommended:  L7    [explanation]

This is 1 of 31 approved meteorites classified as L7.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 7157 (NWA 7157)

(Northwest Africa)

Purchased: 2011

Classification: Ordinary chondrite (L7)

History: Purchased by Marcin Cimała in 2011 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Recrystallized with triple grain junctions. Equigranular aggregate of olivine, orthopyroxene, sodic plagioclase, clinopyroxene, chromite, troilite and metal.

Geochemistry: Olivine (Fa22.6-22.7, N = 3), orthopyroxene (Fs18.8-19.1Wo2.8-3.1, N = 3), clinopyroxene (Fs7.7-8.1Wo44.1-42.6, N = 2).

Classification: Ordinary chondrite (L7).

Specimens: 20.5 g including one polished thin section at PSF; main mass with Mr. M. Cimała.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2011
Mass (g):120
Pieces:1
Class:L7
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):22.6-22.7 (N=3)
Ferrosilite (mol%):18.8-19.1
Wollastonite (mol%):2.8-3.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:PSF
Main mass:M. Cimala
Comments:MC 081; submitted by P. Sipiera
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Woreczko Jan & Wadi      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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