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Northwest Africa 12647
Basic information Name: Northwest Africa 12647
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12647
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 193.4 g
Meteoritical Bulletin:  MB 108  (2020)  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 9 Aug 2019
Writeup from MB 108:

Northwest Africa 12647 (NWA 12647)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Primitive achondrite (Lodranite)

History: Purchased in February 2019 by Darryl Pitt from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed mainly of angular mineral grains of olivine (exhibiting undulose extinction), orthopyroxene and clinopyroxene (twinned) together with accessory chromite, altered metal, chlorapatite and troilite. Sparse polymineralic aggregates are also present. Minor amounts of secondary calcite are present as veinlets. The olivine and pyroxene grains (both individual grains and in the polymineralic aggregates) are up to 4 mm in size.

Geochemistry: Olivine (Fa10.3-10.7, FeO/MnO = 23-24,N = 4), orthopyroxene (Fs10.1-10.6Wo3.2-2.5, FeO/MnO = 14-16, N = 2), clinopyroxene (Fs4.1-5.0Wo44.5-40.7, FeO/MnO = 9-10, N = 3).

Classification: Lodranite (breccia).

Specimens: 20.3 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):193.4
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):10.3-10.7
Ferrosilite (mol%):10.1-10.6; 4.1-5.0
Wollastonite (mol%):3.2-2.5; 44.5-40.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.3
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 461; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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