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Northwest Africa 12941
Basic information Name: Northwest Africa 12941
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12941
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 218 g
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 May 2020
Writeup from MB 109:

Northwest Africa 12941 (NWA 12941)


Purchased: 2012

Classification: HED achondrite (Eucrite)

History: Purchased from A. Aaronson in 2012 at the Tucson Gem and Mineral Show, who provided origin of sample as being from Morocco. Catalogued at the Royal Ontario Museum collection as sample LM58149

Physical characteristics: The meteorite has a weathered, fractured fusion crust on two surfaces, with cracks and an exposed interior faces covered with caliche. Interior of the sample largely light-grey in colour with larger black clasts visible. No shock veins observed.

Petrography: Breccia composed of clasts set in a matrix dominated by large crystal fragments. The majority of the clasts are composed of previously brecciated material. They contain crystal fragments and small gabbroic textured clasts set in a finely comminuted matrix. Mineral grains in both matrix and clasts show undulatory extinction.

Geochemistry: Mineral composition and geochemistry: Plagioclase composition: An90.01±2.34 (n=27) Low Ca-pyroxene composition: Fs43.66±14.83Wo4.90±3.19 and FeO/MnO = 30.06±1.98 (n=24).

Classification: (K. Tait, ROM) Texture and compositions suggest the sample is a polymict eucrite breccia. Lack of clear Opx-dominated composition excludes the possibility of this meteorite being a howardite.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2012
Mass (g):217.58
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):43.66±14.83
Wollastonite (mol%):4.90±3.19
Classifier:K. Tait, I. Nicklin, ROM
Type spec mass (g):20
Type spec location:ROM
Main mass:Dr. David Gregory
Comments:Submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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