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Northwest Africa 7818
Basic information Name: Northwest Africa 7818
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7818
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 167 g
Meteoritical Bulletin:  MB 102  (2013)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3182 approved meteorites (plus 1 unapproved name) classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Jun 2013
Writeup from MB 102:

Northwest Africa 7818 (NWA 7818)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ordinary chondrite (LL5)

History: Purchased by GHupé in February 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fairly sparse, large chondrules and partial chondrules in a recrystallized matrix. Olivine, orthopyroxene, clinopyroxene, sodic plagioclase, altered kamacite, taenite and troilite. Thin shock veins crosscut the specimen.

Geochemistry: Olivine (Fa28.4-28.5), orthopyroxene (Fs23.6-24.1Wo1.4-1.8), clinopyroxene (Fs7.6-8.1Wo45.9-45.6).

Classification: Ordinary chondrite (LL5, moderately shocked).

Specimens: A total of 22.7 g of material and one polished thin section are on deposit at UWB. GHupé holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013 Feb
Mass (g):167
Shock stage:S3
Weathering grade:W0/1
Fayalite (mol%):28.4-28.5
Ferrosilite (mol%):23.6-24.1
Wollastonite (mol%):1.4-1.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):22.7
Type spec location:UWB
Main mass:GHupé
Comments:GH-447; 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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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