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Northwest Africa 12839
Basic information Name: Northwest Africa 12839
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12839
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 68.8 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 86 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12839 (NWA 12839)

(Northwest Africa)

Purchased: 2019 June

Classification: Lunar (diabase)

History: Purchased by Ben Hoefnagels in June 2019 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize 0.5 mm). Composed primarily of zoned clinopyroxene and maskelynite with accessory blade-like ilmenite, very sparse zoned olivine (~3 vol.%), Cr-Ti oxides, baddeleyite, probable zirconolite, troilite, merrillite, silica polymorph, fayalite and hedenbergite. Dark shock glass is present in pockets (vesicular) and as cross-cutting veinlets.

Geochemistry: Subcalcic augite (core Fs28.8Wo26.3, FeO/MnO = 50; rim Fs72.4Wo23.6, FeO/MnO = 77), augite (core Fs21.2Wo38.7, FeO/MnO = 47; rim Fs81.5Wo17.7, FeO/MnO =81), pigeonite (core Fs41.8Wo12.9,FeO/MnO = 65; rim Fs69.8Wo22.4, FeO/MnO = 77), olivine cores (Fa37.6-39.5, FeO/MnO = 92-94, N = 3), olivine rims (Fa54.1-68.2, FeO/MnO = 93-110, N = 3), fayalite (Fa99.2, FeO/MnO = 95), maskelynite (An87.5-88.2Or0.3, N = 2).

Classification: Lunar (mare diabase, clinopyroxene-rich, olivine-poor).

Specimens: 14.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2019 June
Mass (g):68.75
Pieces:1
Class:Lunar (diabase)
Shock stage:high
Weathering grade:low
Fayalite (mol%):37.6-68.2
Ferrosilite (mol%):21.2-81.5
Wollastonite (mol%):38.7-12.9
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):14.1
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH211; submitted by A. Irving
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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