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Northwest Africa 12643
Basic information Name: Northwest Africa 12643
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12643
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 2.6 kg
Meteoritical Bulletin:  MB 108  (2020)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 31 May 2019
Writeup from MB 108:

Northwest Africa 12643 (NWA 12643)

(Northwest Africa)

Purchased: 2019 Feb

Classification: Lunar meteorite (feldspathic breccia)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of angular mineral grains of predominantly anorthite together with olivine, low-Ca pyroxene, augite, Ti-chromite and minor secondary barite.

Geochemistry: Plagioclase (An96.4-96.6Or0.1, N = 2), olivine (Fa25.4-25.8, FeO/MnO = 92-93, N = 2), low-Ca pyroxene (Fs20.6-20.9Wo4.3-3.5, FeO/MnO = 51-52, N = 2), augite (Fs10.5-10.6Wo42.3-41.6, FeO/MnO = 33-35, N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: 20.4 g including a polished endcut and a polished epoxy mount at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2019 Feb
Mass (g):2602
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):25.4-25.8
Ferrosilite (mol%):20.6-20.9
Wollastonite (mol%):4.3-3.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.4
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 456; 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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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