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Northwest Africa 12000
Basic information Name: Northwest Africa 12000
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12000
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 225 g
Meteoritical Bulletin:  MB 107  (2018)  Iron, IIAB
Recommended:  Iron, IIAB    [explanation]

This is 1 of 145 approved meteorites classified as Iron, IIAB.   [show all]
Search for other: IIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 20 Oct 2018
Writeup from MB 107:

Northwest Africa 12000 (NWA 12000)


Purchased: May 2017

Classification: Iron meteorite (IIAB)

History: Purchased by Zhang Qingyan in May 2017 from a Moroccan dealer during the China (Hunan) Mineral & Gem Show in Chenzhou City

Physical characteristics: The main mass is approximately 2 × 5 × 10 cm with a dark brown, regmaglypted exterior. Some rust-red spots and adhered caliche are visible.

Petrography: (C. Herd) A 1 × 2 cm polished and etched slice shows an equant texture of kamacite crystals at least as wide as the slice (1 cm) with interstitial schreibersite. The cm-scale kamacite is replaced by sub-500 μm equant crystals. Neumann lines are present.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen UAb): Ni = 5.7, Co = 0.49 (both wt%); Cu = 123, Ga = 55, As = 9.5, Ru = 3.4, W = 0.7, Ir = 0.03, Pd = 2.5, Pt = 4.5, Au = 1.1 (all μg/g).

Classification: Iron, IIAB. Recrystallized texture.

Specimens: Type specimen of 24.3 g at UAb. Zhang Qingyan 103 g, Liang Chengguang 28 g, M. Ouzillou 69.3 g.

Data from:
  Table 0
  Line 0:
Place of purchase:Chenzhou City
Date:P May 2017
Mass (g):225
Class:Iron, IIAB
Shock stage:moderate
Weathering grade:low
Classifier:C. Herd and L. Tunney, UAb
Type spec mass (g):24.3
Type spec location:UAb
Main mass:Zhang Qingyan
Comments:Field number MMO-2018-3B; submitted by C. Herd
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang            


     This is 1 of 1871 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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