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Northwest Africa 10840
Basic information Name: Northwest Africa 10840
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10840
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 210 kg
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  L4
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 24 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 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10840 (NWA 10840)

(Northwest Africa)

Purchased: 2016 Feb

Classification: Ordinary chondrite (L4)

History: Found in Morocco and purchased in Laayoune, Morocco by Aziz Habibi in February 2016.

Physical characteristics: A single very large (210 kg), dark stone lacking fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed chondrules occur within a relatively coarse-grained matrix containing altered metal. Silicate phases exhibit undulose extinction and are darkened by the presence of very fine grained included metal blebs.

Geochemistry: Olivine (Fa23.4-23.5, N = 3), orthopyroxene (Fs19.8-20.2Wo1.8-1.4, N = 3), clinopyroxene (Fs7.6-7.8Wo45.7-44.1, N = 2).

Classification: Ordinary chondrite (L4).

Specimens: 94 g including one polished thin section at UWB; remainder with Mr. A. Habibi.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Laayoune
Date:P 2016 Feb
Mass (g):210000
Pieces:1
Class:L4
Shock stage:S4
Weathering grade:W2/3
Fayalite (mol%):23.4-23.5
Ferrosilite (mol%):19.8-20.2
Wollastonite (mol%):1.8-1.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):94
Type spec location:UWB
Main mass:A. Habibi
Comments:AH211; submitted by A. Irving
Institutions
   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)
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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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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