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Northwest Africa 10857
Basic information Name: Northwest Africa 10857
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10857
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 352 g
Meteoritical Bulletin:  MB 105  (2016)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 89 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 26 Nov 2016
Writeup from MB 105:

Northwest Africa 10857 (NWA 10857)

(Northwest Africa)

Purchased: 2015 Oct

Classification: Primitive achondrite (Lodranite)

History: Purchased by Marc Jost in October 2015 from a Moroccan dealer at the Munich Show.

Petrography: (A. Irving and S. Kuehner, UWS) Heterogeneous, highly recrystallized and partly annealed breccia composed of polymineralic clasts and related mineral debris. Some deformed orthopyroxene grains are up to 4 mm in size, but most mineral grains are much smaller and variable in size. Minerals are olivine, orthopyroxene, clinopyroxene, chromite, altered Ni-poor kamacite and troilite.

Geochemistry: Olivine (Fa10.6-10.9, FeO/MnO = 33-35, N = 3), orthopyroxene (Fs9.9-10.0Wo1.0-2.2, FeO/MnO = 18-19, N = 2), clinopyroxene (Fs3.6-4.4Wo46.3-43.5, FeO/MnO = 10-13, N = 2).

Classification: Lodranite (recrystallized breccia).

Specimens: 20.1 g including one polished thin section at UWB; remainder with SJS.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2015 Oct
Mass (g):352
Shock stage:low
Weathering grade:low
Fayalite (mol%):10.6-10.9
Ferrosilite (mol%):9.9-10.0; 3.6-4.4
Wollastonite (mol%):1.0-2.2; 46.3-43.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:Space Jewels Switzerland
Comments:SJS 16005; 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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
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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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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