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Northwest Africa 12767
Basic information Name: Northwest Africa 12767
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12767
Observed fall: No
Year found: 2018
Country: Mali
Mass:help 6.31 kg
Meteoritical Bulletin:  MB 108  (2020)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 150 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Approved 3 Aug 2019
Writeup from MB 108:

Northwest Africa 12767 (NWA 12767)


Find: April 2018

Classification: Iron meteorite (ungrouped)

History: A single 6.3 kg mass was found in Mali in April 2018

Physical characteristics: The main mass is an irregularly shaped rock with a dark-brown exterior and no obvious regmaglypts.

Petrography: (C. Herd and L. Tunney, UAb) Optical and SEM examination of a 3.5 × 4 cm polished and etched slice, as well as images of etched surfaces provided by the owner, show kamacite spindles up to a few mm long and approximately 100 μm wide, often in clusters. Schreibersite grains are typically enclosed by kamacite; the matrix consists of taenite exsolved on a sub-μm scale. Also visible are trains of elongate kamacite crystals up to several cm long and 1-2 mm wide. These crystals are also cored by scheibersite. No inclusions were observed on any cut surfaces, and no weathering veins are evident.

Geochemistry: (C. Herd and L. Tunney, UAb) ICP-MS data, using sample of North Chile (Filomena) as standard: Ni = 12.3, Co = 0.80 (both wt%); Ir = 5.0, Ga = 28, Ge = 139, As = 22.8, W = 1.0, Re = 0.35, Pd = 5.9, Pt = 20.9, Cu = 179, Au = 2.5 (all µg/g).

Classification: Iron, ungrouped. Although the composition suggests a relationship to the IAB-sHL subgroup, Co, Ir and Pt are all too high. The lack of silicate inclusions is also inconsistent with the IAB group.

Specimens: Type specimen of 61.9 g at UAb. Main mass with A. Habibi.

Data from:
  Table 0
  Line 0:
Date:April 2018
Mass (g):6309
Class:Iron, ungrouped
Shock stage:low
Weathering grade:low
Classifier:C. Herd and L. Tunney, UAb
Type spec mass (g):61.9
Type spec location:UAb
Main mass:A. Habibi
Comments:Field number AH70; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 100 approved meteorites from Mali (plus 2 unapproved names)

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