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Northwest Africa 12216
Basic information Name: Northwest Africa 12216
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12216
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 34.4 g
Meteoritical Bulletin:  MB 108  (2020)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 291 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 5 Jan 2019
Writeup from MB 108:

Northwest Africa 12216 (NWA 12216)


Purchased: 2018 May

Classification: Lunar meteorite (feldspathic breccia)

History: Found near Wad Alma, Algeria and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer.

Physical characteristics: A small (34.4 g) unusually hard, dark-gray stone, mostly very fine grained and vesicular with sparse white clasts.

Petrography: (A. Irving and S. Kuehner, UWS) Small mineral clasts of anorthite, low-Ca pyroxene, subcalcic augite and olivine are set in a very fine-grained, vesicular matrix containing ilmenite, Ti-poor chromite, kamacite and troilite.

Geochemistry: Olivine (Fa19.9-37.1, FeO/MnO = 80-119, N = 3), low-Ca pyroxene (Fs26.9Wo4.9, FeO/MnO = 53), pigeonite (Fs23.8Wo7.1, FeO/MnO = 50), subcalcic augite (Fs62.6Wo28.7, FeO/MnO = 75; Fs13.3Wo39.1, FeO/MnO = 36), plagioclase (An96.9-97.4Wo0.2-0.1, N = 2).

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 9.2 g including one polished endcut at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 May
Mass (g):34.4
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):19.9-37.1
Ferrosilite (mol%):23.8-26.9
Wollastonite (mol%):7.1-4.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.2
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 366; 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)
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 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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