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Northwest Africa 12996
Basic information Name: Northwest Africa 12996
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12996
Observed fall: No
Year found: 2019
Country: Western Sahara
Mass:help 2.04 kg
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 240 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12996 (NWA 12996)

Western Sahara

Find: 2019

Classification: HED achondrite (Eucrite, monomict)

History: Found in Western Sahara in spring 2019. Purchased in Mauritania in the summer of 2019.

Physical characteristics: Dozens of specimens mostly broken pieces, fresh black fusion crust, saw cut reveals a mildly brecciated texture with basaltic clasts set in dark-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination shows a mix of pyroxene and plagioclase grains most in the range 200-500 μm. Many pyroxene grains have exsolution lamellae. Ubiquitous minor FeTi-oxide, troilite, and silica observed.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs54.8±3.1Wo4.5±4.5, Fe/Mn=36±1, n=9; high-Ca pyroxene Fs34.7Wo30.9, Fe/Mn=34, n=1; plagioclase An80.1±6.1, n=2.

Classification: Monomict eucrite

Specimens: 22.6 g on deposit at UNM, DPitt holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:2019
Mass (g):2042
Pieces:Many
Class:Eucrite-mmict
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):54.8±3.1, 34.7
Wollastonite (mol%):4.5±4.5, 30.9
Classifier:C. Agee, UNM
Type spec mass (g):22.6
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 223 approved meteorites from Western Sahara (plus 19 unapproved names)

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