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Northwest Africa 12339
Basic information Name: Northwest Africa 12339
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12339
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 634 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 358 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12339 (NWA 12339)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite, polymict)

Physical characteristics: Stone is partially crusted with black glassy fusion crust. The interior is light gray with brown staining.

Petrography: (Z.G. Guo, UWO) This is a brecciated meteorite, in which the size of clasts varies from 300 μm to 8 mm. The metal content is low (<1%). A silica polymorph was observed. Other shock features like shock melt veins and sheared pyroxene exsolution lamellae were observed in thin section.

Geochemistry: (EMPA, Z.G. Guo and M. Beauchamp, UWO) The compositions of two pyroxenes vary among clasts and host matrix. Host: low-Ca pyroxene Fs63.9±2.0Wo2.3±2.0, Fe/Mn=28.6±0.7 (N=5), high-Ca pyroxene Fs31.7±3.7Wo39.9±4.2,Fe/Mn=29.0±1.3 (N=5) and plagioclase An90.1±2.7 (N=13); Clasts: low-Ca pyroxene Fs55.4±3.9Wo13.3±4.8, Fe/Mn=28.6±0.2 (N=3); high-Ca pyroxene Fs36.5±3.8Wo32.6±4.5, Fe/Mn=27.8±0.5 (N=3), and plagioclase (2) An72.0±4.2, N=6.

Classification: Polymict eucrite

Specimens: 20.8g at UWO including a probe mount.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):634
Pieces:1
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):33.0±3.9 (N=10); 61.6±4.9 (N=10)
Wollastonite (mol%):38.1±5.3 (N=10); 5.5±6.0 (N=10)
Classifier:Z.G. Guo, UWO
Type spec mass (g):20.8
Type spec location:UWO
Main mass:R. Watts
Comments:UWO-244; submitted by A. Bouvier
Institutions
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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