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Northwest Africa 12645
Basic information Name: Northwest Africa 12645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12645
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 231 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 275 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 31 May 2019
Writeup from MB 108:

Northwest Africa 12645 (NWA 12645)

(Northwest Africa)

Purchased: 2019 Feb

Classification: HED achondrite (Eucrite, monomict)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen containing sparse lithic clasts of diabasic eucrite, but made up predominantly of related crystalline debris. Major phases are unexsolved pigeonite and maskelynite together with accessory silica polymorph, fayalite, orthopyroxene, ferroan subcalcic augite, chlorapatite, ilmenite and troilite. Grains of pyroxene and maskelynite in the lithic clasts and those occurring as disaggregated debris exhibit a prominent preferred orientation.

Geochemistry: Pigeonite (Fs46.5-50.8Wo12.4-14.3, FeO/MnO = 28-30, N = 2), ferroan subcalcic augite (Fs62.7Wo26.0, FeO/MnO = 35), orthopyroxene (Fs36.3Wo4.4; Fs42.7Wo0.8; FeO/MnO = 30; N = 2), fayalite (Fa75.6-78.5, FeO/MnO = 43), maskelynite (An86.9-89.9Or0.5-0.4, N = 2).

Classification: Eucrite (monomict breccia with laminar fabric, maskelynite-bearing).

Specimens: 24 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):230.6
Shock stage:high
Weathering grade:low
Fayalite (mol%):78.5
Ferrosilite (mol%):46.5-50.8
Wollastonite (mol%):12.4-14.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):24
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 460; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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