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Northwest Africa 7828
Basic information Name: Northwest Africa 7828
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7828
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 4.77 kg
Meteoritical Bulletin:  MB 102  (2013)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 55 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 14 Nov 2013
Writeup from MB 102:

Northwest Africa 7828 (NWA 7828)

(Northwest Africa)

Purchased: 2013 Mar

Classification: Primitive achondrite (Brachinite)

History: Purchased in Temara, Morocco, by Adam Aaronson in December 2012.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular assemblage of predominantly olivine with subordinate clinopyroxene, Ti-V-Al-bearing chromite and pyrrhotite. Some larger pyroxene grains contain rounded chadacrysts of olivine. Along the margins of olivine grains and also on interior fractures are distinctive arrays of intergrown pure Fe metal + orthopyroxene.

Geochemistry: Olivine (Fa25.4-27.0; FeO/MnO = 41-52), clinopyroxene (Fs10.6-10.7Wo44.5-44.7; FeO/MnO = 25-29), orthopyroxene (Fs20.8-21.0Wo0.9-1.2; FeO/MnO = 32-33).

Classification: Achondrite (brachinite, anomalous). The reduction textures associated with olivine make this specimen distinct from typical brachinites. The very close similarity in textures and mineral compositions to those in NWA 7605 suggests that these are paired stones.

Specimens: 20.1 g of material and one polished thin section are at UWB. The remaining material is held by Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2013 Mar
Mass (g):4772
Shock stage:low
Weathering grade:low
Fayalite (mol%):25.4-27.0
Ferrosilite (mol%):10.6-10.7
Wollastonite (mol%):44.5-44.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1529; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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