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Northwest Africa 11637
Basic information Name: Northwest Africa 11637
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11637
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 4.37 kg
Meteoritical Bulletin:  MB 107  (2018)  Iron, IIAB
Recommended:  Iron, IIAB    [explanation]

This is 1 of 150 approved meteorites classified as Iron, IIAB.   [show all]
Search for other: IIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 20 Feb 2018
Writeup from MB 107:

Northwest Africa 11637 (NWA 11637)


Purchased: May 2017

Classification: Iron meteorite (IIAB)

History: On May 21, 2017, during the China (Hunan) Mineral and Gem Show in Chenzhou, China, Wang Chen purchased 3 individual specimens (3096 g, 1100 g, 172.3 g) from a Moroccan dealer attending the show.

Physical characteristics: The three pieces have a dark brown exterior with minor rust-colored spots.

Petrography: (C. Herd, UAb) Optical investigation of a ~4 × 5 cm polished and etched surface reveals a well-developed Widmanstatten pattern consistent with a coarsest octahedrite (3.6±1 mm; n=6). No obvious inclusions were noted. Terrestrial alteration has occurred along fractures connecting to the exterior.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen UAb): Ni = 5.7, Co = 0.47 (both wt%); Ir = 2.3, Ga = 54, Ge = 137, As = 4.8, W = 2.5, Re = 0.15, Pt = 18.3, Cu = 139, Au = 0.5 (all μg/g).

Classification: (C. Herd, UAb): IIAB iron, through comparison of bulk composition with data from Wasson et al. (2007).

Specimens: Type specimen consisting of two representative slices (13.5 and 11.8 g) at UAb. Wang Chen holds the main mass (2910 g), Wang Ziyao the 1100 g individual, and Mendy Ouzillou holds the 172.3 g individual and a 117.5 g end cut from the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Chenzhou
Date:P May 2017
Mass (g):4368
Class:Iron, IIAB
Shock stage:low
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):25.2
Type spec location:UAb
Main mass:Wang Chen
Comments: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)
Chunliang Zhang         


     This is 1 of 2085 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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