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Northwest Africa 12770
Basic information Name: Northwest Africa 12770
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12770
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 1121 g
Meteoritical Bulletin:  MB 108  (2020)  Iron, IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 336 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 26 Sep 2019
Writeup from MB 108:

Northwest Africa 12770 (NWA 12770)


Purchased: January 2019

Classification: Iron meteorite (IIIAB)

History: Six stones ranging from 53 g to 327 g, purchased from a dealer in Essaouria in January 2019.

Physical characteristics: The six stones range in size from ~3 to 10 cm in longest dimension, and consist of a suite of irregularly shaoed masses with mottled brown and rusty red exterior surfaces.

Petrography: (C. Herd, L. Tunney, and R. Bukatiuk, UAb) A 2 × 3 cm polished and etched slice shows a well-developed Widmanstatten pattern with average kamacite bandwidth of 0.9 ± 0.3 mm (n=11). No inclusions were observed.

Geochemistry: (C. Herd and L. Tunney, UAb) ICP-MS data, using sample of North Chile (Filomena) as standard: Ni = 7.3, Co = 0.47 (both wt%); Ir = 12.2, Ga = 16.7, Ge = 27.2, As = 3.8, W = 1.0, Re = 1.2, Os = 2.6, Pt = 15.5, Cu = 169, Au <1.0 (all µg/g).

Classification: Iron, IIIAB, medium octahedrite

Specimens: Type specimen of 26.2 g at UAb. Main mass with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Essaouria
Date:P January 2019
Mass (g):1121.3
Class:Iron, IIIAB
Shock stage:low
Weathering grade:low
Classifier:C. Herd and L.Tunney, UAb
Type spec mass (g):26.2
Type spec location:UAb
Main mass:F. Kuntz
Comments:Field number K419; 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)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1852 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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