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Northwest Africa 12944
Basic information Name: Northwest Africa 12944
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12944
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 6.2 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 468 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 12944 (NWA 12944)

Morocco

Purchased: 2006

Classification: HED achondrite (Eucrite)

History: Purchased from A. Habibi in 2006 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 LM59807

Physical characteristics: Visible fusion crust exhibiting 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: The thin section of this small specimen, largest dimensions are 1.5 by 1.0 cm, is dominated by 4 clasts with a gabbroic texture. The pyroxenes are mostly lath-shaped although a few more equant grains are present. Plagioclase is difficult to observe and appears to have been maskelynized. The clasts are separated by a very fine grained to glassy comminuted matrix with some isolated crystal fragments. The entire specimen, clasts and matrix, are shock darkened and the pyroxene lathes show radial extinction.

Geochemistry: Mineral composition and geochemistry: Plagioclase composition: An82.2±5.06Or0.24±0.15 (n=19). Low Ca-pyroxene composition: Fs33.68±0.64Wo8.39±2.85 and FeO/MnO = 32.72±0.57 (n =7). High Ca-pyroxene composition: Fs30.43±1.15Wo30.60±7.63 and FeO/MnO = 32.71±1.08 (n=16).

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

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2006
Mass (g):6.19
Pieces:2
Class:Eucrite
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):33.68±0.64; 30.43±1.15
Wollastonite (mol%):8.39±2.85; 30.60±7.63
Classifier:K. Tait, I. Nicklin, ROM
Type spec mass (g):1.24
Type spec location:ROM
Main mass:Simon De Boer
Comments:Submitted by V. Di Cecco, ROM
Institutions
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1476 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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