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Northwest Africa 12245
Basic information Name: Northwest Africa 12245
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12245
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 80.8 g
Meteoritical Bulletin:  MB 107  (2018)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 24 Nov 2018
Writeup from MB 107:

Northwest Africa 12245 (NWA 12245)

(Northwest Africa)

Purchased: 2018 Apr

Classification: HED achondrite (Diogenite)

History: Purchased by Fred Olsen in April 2018 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of angular grains of orthopyroxene (exhibiting undulose extinction and containing sparse exsolution lamellae of clinopyroxene), anorthite (~15 vol.%, polycrystalline), silica polymorph, chromite, troilite and Ni-free metal. Some composite clasts containing both orthopyroxene and anorthite are present, as well as pockets composed of radially-quenched shock melt.

Geochemistry: Orthopyroxene host (Fs34.0-34.1Wo2.3-2.8, FeO/MnO = 27-29, N = 3), clinopyroxene exsolution lamellae (Fs14.3-15.6Wo44.4-42.8, FeO/MnO = 24-25, N = 2), anorthite (An94.0-95.1Or0.4-0.3, N = 2).

Classification: Diogenite (noritic breccia, shocked).

Specimens: 16.32 g including one polished thin section at UWB; remainder with the estate of Mr. F. Olsen managed by D. Baldwin.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 Apr
Mass (g):80.77
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):34.0-34.1
Wollastonite (mol%):2.3-2.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):16.32
Type spec location:UWB
Main mass:F. Olsen/D. Baldwin
Comments:Work name FO18-1; 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)
Olsen: Unknown person (private address; updated 17 Apr 2009)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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