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Northwest Africa 7187
Basic information Name: Northwest Africa 7187
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7187
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 480 g
Meteoritical Bulletin:  MB 104  (2015)  L3
Recommended:  L3    [explanation]

This is 1 of 795 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 22 Oct 2015
Writeup from MB 104:

Northwest Africa 7187 (NWA 7187)

Northwest Africa

Purchased: 2011 Sep

Classification: Ordinary chondrite (L3)

History: Purchased by Eric Twelker in September 2011 from a Moroccan dealer at the Denver Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh specimen composed of closely packed, well-formed chondrules (apparent diameter mostly 1.2±0.9 mm, one 4 mm) in a matrix containing a moderate amount of fresh metal grains, troilite, chlorapatite and merrillite. Some chondrules have multiple thick dust rims.

Geochemistry: Olivine (Fa0.5-35.3; Cr2O3 in ferroan olivine 0.02-0.08 wt.%, mean 0.04±0.02 wt.%, N = 7), orthopyroxene (Fs4.9-20.5Wo0.4-1.5, N = 3), clinopyroxene (Fs6.8-6.9Wo38.1-45.3, N = 2).

Classification: Ordinary chondrite (L3).

Specimens: 27.4 g including one polished thin section at UWB; the remainder is held by welker.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2011 Sep
Mass (g):480
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):0.5-35.3
Ferrosilite (mol%):4.9-20.5
Wollastonite (mol%):0.4-1.5
Magnetic suscept.:4.87
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.4
Type spec location:UWB
Main mass:E. Twelker
Comments:ET11-1; submitted by A. Irving
   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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   

     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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