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Northwest Africa 12973
Basic information Name: Northwest Africa 12973
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12973
Observed fall: No
Year found: 2019
Country: Tunisia
Mass:help 1500 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 5 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12973 (NWA 12973)

Tunisia

Purchased: 2019 Mar

Classification: HED achondrite (Diogenite, anomalous)

History: Found in Tunisia in January 2019 and purchased in Agadir, Morocco by Aziz Habibi in March 2019.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Protogranular texture with prominent triple grain junctions. The major constituent is orthopyroxene, but there are domains of polycrystalline olivine (~5 vol.% overall). Spherical vesicles (empty, up to 3 mm in diameter) are present. Accessory phases include clinopyroxene, V-bearing chromite and troilite, plus minor secondary calcium sulfate and barite.

Geochemistry: Orthopyroxene (Fs23.6-23.8Wo3.9-3.5, FeO/MnO = 28-31, N = 4), olivine (Fa28.6-29.0, FeO/MnO = 48-53, N = 3), clinopyroxene (Fs11.2Wo42.9, FeO/MnO = 22).

Classification: Diogenite (anomalous, vesicular, olivine-bearing). The prominent vesicles in this specimen are an anomalous feature.

Specimens: 21.9 g including one polished thin section and one polished mount at UWB; remainder with Mr. A. Habibi.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2019 Mar
Mass (g):1500
Pieces:many
Class:Diogenite-an
Shock stage:low
Weathering grade:low
Fayalite (mol%):28.6-29.0
Ferrosilite (mol%):23.6-23.8
Wollastonite (mol%):3.9-3.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.9
Type spec location:UWB
Main mass:A. Habibi
Comments:Work name AH 780; 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 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
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Geography:

Tunisia
Coordinates:Unknown.

Statistics:
     This is 1 of 77 approved meteorites from Tunisia

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