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Northwest Africa 12943
Basic information Name: Northwest Africa 12943
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12943
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 814 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 12943 (NWA 12943)


Purchased: 2011

Classification: HED achondrite (Eucrite)

History: Purchased from A. Aaronson in 2011 at the Tucson Gem and Mineral Show, who provided origin of sample as being from Morocco. Catalogued in the Royal Ontario Museum as sample LM55992

Physical characteristics: Visible fusion crust showing low to moderate weathering, evident by a light beige coloring. Cracks in the fusion crust filled in with caliche. Interior of the sample is intact, uniform and pale grey with a fine-grained texture.

Petrography: Breccia composed of gabbroic clasts set in a comminuted matrix of coarsely grained crystal fragments. Crystal fragments range from 80-900 μm. The largest clast is 1.2 by 1.0 cm. Variable shock state. Some grains, mostly in clasts, go into extinction while others show mosaicism.

Geochemistry: Mineral composition and geochemistry: Plagioclase composition: An91.52±0.83Or0.05±0.01 (n=23). Low Ca-pyroxene composition: Fs41.03±0.20Wo 3.40±1.29 and FeO/MnO = 28.89±0.58 (n =17). High Ca-pyroxene composition: Fs34.05±1.10Wo38.21±6.41 and FeO/MnO = 29.45±0.84 (n=7).

Classification: (K. Tait, ROM) Texture and compositions suggest the sample is a polymict eucrite breccia.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2011
Mass (g):814.13
Shock stage:moderate
Weathering grade:low to m
Ferrosilite (mol%):41.03±0.20; 34.05±1.10
Wollastonite (mol%):3.40±1.29; 38.21±6.41
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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