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Northwest Africa 7836
Basic information Name: Northwest Africa 7836
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7836
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 240 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 501 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 8 Nov 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7836 (NWA 7836)

(Northwest Africa)

Found: 2011 Jun

Classification: HED achondrite (Eucrite)

History: Found in Morocco in June 2011 and purchased by GHupé from a Moroccan dealer at the Tucson Gem and Mineral Show in February 2013.

Physical characteristics: A single, relatively coarse grained stone (240 g) with a weathered brownish exterior. The fresh interior consists of irregularly distributed grains of brown and black pyroxene and grayish white plagioclase.

Petrography: (A. Irving and S. Kuehner, UWS) Composed predominantly of fairly coarse grained, unexsolved, partially shock-darkened pigeonite and highly recrystallized anorthite (consisting of very fine polygonal subgrains) with accessory silica polymorph, troilite (some as myriad blebs in pigeonite), chromite and Ni-free metal. This specimen has experienced significantly more shock than typical eucrites (estimated at stage S5).

Geochemistry: Pigeonite (Fs44.0-45.0Wo11.4-12.5; FeO/MnO = 26-31).

Classification: Eucrite (gabbroic, shocked).

Specimens: A 26.8 g type specimen is housed at UCLA and a polished thin section prepared from additional material is at UWB. GHupé holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Tucson
Date:2011 Jun
Mass (g):240
Pieces:1
Class:Eucrite
Weathering grade:low
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27
Type spec location:UCLA/UWB
Main mass:GHupé
Comments:GH-444; submitted by A. Irving
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 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)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7727 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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