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Northwest Africa 11805
Basic information Name: Northwest Africa 11805
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11805
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 109.4 g
Meteoritical Bulletin:  MB 107  (2018)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 49 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 28 May 2018
Writeup from MB 107:

Northwest Africa 11805 (NWA 11805)

(Northwest Africa)

Purchased: 2018 Jan

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Christopher Colvin in January 2018 from a dealer in Arizona, who had obtained the specimen from a Moroccan source.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of angular mineral debris plus sparse lithic clasts of diogenite and microgabbroic eucrite. The majority (>90 vol.%) of the mineral debris is diogenitic (orthopyroxene, olivine, chromite) with minor eucritic exsolved pigeonite, calcic plagioclase, silica polymorph, Ti-chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs23.4-24.5Wo2.3-2.0; Fs17.1Wo0.9; FeO/MnO = 27-32; N = 3), olivine (Fa28.9; Fa 52.0; FeO/MnO = 44-49; N = 2), orthopyroxene host (Fs44.7Wo3.5, FeO/MnO = 33), clinopyroxene exsolution lamella (Fs23.0Wo39.4, FeO/MnO = 26), plagioclase (An88.6-90.3Or0.5-0.4, N = 2).

Classification: Diogenite (polymict breccia).

Specimens: 21.1 g including one polished thin section at UWB; remainder with Mr. C. Colvin.

Data from:
  Table 0
  Line 0:
Place of purchase:Arizona
Date:P 2018 Jan
Mass (g):109.4
Shock stage:low
Weathering grade:low
Fayalite (mol%):28.9; 52.0
Ferrosilite (mol%):23.4-24.5
Wollastonite (mol%):2.3-2.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.1
Type spec location:UWB
Main mass:C. Colvin
Comments:CC18-1; 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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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