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Northwest Africa 12956
Basic information Name: Northwest Africa 12956
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12956
Observed fall: No
Year found: 2017
Country: Mauritania
Mass:help 162 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 349 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12956 (NWA 12956)

Mauritania

Find: 2017

Classification: HED achondrite (Eucrite, polymict)

History: Purchased in 2017 by V. Oullet from a seller in Mauritania.

Physical characteristics: Single stone with almost absent fusion crust. A slice of the interior reveals an assortment of light and dark clasts.

Petrography: (D. Sheikh, FSU) Sample is a breccia composed predominantly of cumulate and basaltic eucritic clasts (>4 mm) set in a dark fine-grained matrix. Some diogenitic clasts are present as well (<10% volume). Minerals present include orthopyroxene, pigeonite, augite, calcic plagioclase, ilmenite, and troilite.

Geochemistry: Low-Ca pyroxene (Fs41.4±9.6 Wo4.1±2.4, Fe/Mn=32, n=63), diogenitic orthopyroxene (Fs25.7±2.4Wo1.8±0.7, Fe/Mn=28, n=14), high-Ca pyroxene (Fs25.8±2.4Wo40.5±3.5, Fe/Mn=29, n=7), calcic plagioclase (An90.5±1.9Or0.3±0.1, n=15), ilmenite (Fe/(Fe+Mg)=95, n=2).

Classification: Eucrite (polymict breccia)

Specimens: 20.03 grams at UCLA; main mass with V. Oullet.

Data from:
  MB108
  Table 0
  Line 0:
Date:2017
Mass (g):162
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Classifier:D. Sheikh, FSU
Type spec mass (g):20.03
Type spec location:UCLA
Main mass:V. Oullet
Comments:Submitted by Daniel Sheikh
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)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 128 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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