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Northwest Africa 12231
Basic information Name: Northwest Africa 12231
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12231
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 13 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 364 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12231 (NWA 12231)

(Northwest Africa)

Purchased: 2018

Classification: HED achondrite (Howardite)

History: Purchased by V. Ouellet in Zagora in 2018.

Physical characteristics: The sample is a small stone with black fusion crust and a light grey, fine-grained interior.

Petrography: The sample is a fine-grained polymict breccia. Modal percentages of lithic fragments (in vol.%): cumulate eucrite clasts, 40%; basaltic eucrites, 30%; diogenitic clasts, 20%; anorthosite clasts, 5%; opaques, 3%; glass, 2%.

Geochemistry: Eucritic pyroxene: pigeonite (Fs47.1±4.3Wo15.8±4.3), n=15; augite (Fs38.9±3.8Wo31.2±3.6), n=6. Diogenitic pyroxene: orthopyroxene (Fs18.05 ±1.6Wo4.54±1.6), n=9. Calcic plagioclase (An88.4±4.2), N=15. Ilmenite (Fe/(Fe+Mg)) = 90.06%, N=4. Chromite, FeS and FeO Present. Silica-rich glass present.

Classification: howardite

Specimens: 3 g part slice at UCLA. 1 g powdered sample with C. Anderkin. Remainder of mass with V. Oullet.

Data from:
  MB107
  Table 0
  Line 0:
Date:P 2018
Mass (g):13
Pieces:One
Class:Howardite
Shock stage:None
Weathering grade:Low
Classifier:C. Anderkin
Type spec mass (g):3
Type spec location:UCLA
Main mass:Main mass with V. Oeullet.
Comments:Submitted by Christian Anderkin
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Anderkin   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6592 approved meteorites from (Northwest Africa) (plus 2020 unapproved names)

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