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Northwest Africa 12968
Basic information Name: Northwest Africa 12968
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12968
Observed fall: No
Year found: 2019
Country: Mauritania
Mass:help 257 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 180 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12968 (NWA 12968)

Mauritania

Purchased: 2019 Jul

Classification: HED achondrite (Eucrite, brecciated)

History: Purportedly found in Mauritania and purchased by Jason Phillips in July 2019 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mineral clasts of exsolved pigeonite, calcic plagioclase, pigeonite and subcalcic augite together with accessory silica polymorph in a finer grained matrix containing ilmenite (with marginal zircon blebs), troilite and secondary barite.

Geochemistry: Low-Ca pyroxene host (Fs59.4-61.1Wo2.3-1.6, FeO/MnO = 33-36, N = 3), pigeonite (Fs35.6-44.1Wo9.0-10.1, FeO/MnO = 29-34, N = 2), orthopyroxene rim on pigeonite (Fs59.5Wo1.9, FeO/MnO = 33), subcalcic augite (Fs39.7-44.2Wo27.7-22.3, FeO/MnO =33, N = 2), plagioclase (An85.1Or0.5).

Classification: Eucrite (breccia).

Specimens: 20.2 g including one thin section and one polished endcut at UWB; remainder held Mr. J. Phillips.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2019 Jul
Mass (g):257.3
Pieces:1
Class:Eucrite-br
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.4-61.1; 35.6-44.1; 39.7-44.2
Wollastonite (mol%):2.3-1.6; 9.0-10.1; 27.7-22.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.2
Type spec location:UWB
Main mass:J. Phillips
Comments:Work name JP19-1; 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:
Find references in Google Scholar:
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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