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Northwest Africa 8426
Basic information Name: Northwest Africa 8426
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8426
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 581 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 25 Nov 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8426 (NWA 8426)

(Northwest Africa)

Purchased: 2014 Mar

Classification: HED achondrite (Eucrite, monomict)

History: Purchased in Temara, Morocco by Adam Aaronson in March 2014.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of large gabbroic eucrite clasts within a sparse matrix of finer related mineral debris. Clasts consist of reddish-brown pigeonite (zoned and partly exsolved), polycrystalline calcic plagioclase, silica polymorph, ilmenite, Ti-chromite and troilite.

Geochemistry: Pigeonite grains consist of exsolution lamellae of clinopyroxene (Fs27.5-29.2Wo42.6-40.1; FeO/MnO = 28-31, N = 3) within host orthopyroxene (Fs59.4-59.9Wo4.6-3.6; FeO/MnO = 28-30, N = 3).

Classification: Eucrite (breccia, gabbroic). This specimen is likely paired with NWA 7989 and other such stones based on close similarities in lithology, shock and style of weathering.

Specimens: 20.5 g including one polished thin section at UWB. The remainder is held by Aaronson.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2014 Mar
Mass (g):581
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):27.5-29.2; 59.4-59.9
Wollastonite (mol%):42.6-40.1; 4.6-3.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.5
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1691; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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