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Northwest Africa 12768
Basic information Name: Northwest Africa 12768
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12768
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 54.9 g
Meteoritical Bulletin:  MB 108  (2020)  Iron, IIE
Recommended:  Iron, IIE    [explanation]

This is 1 of 17 approved meteorites classified as Iron, IIE.   [show all]
Search for other: IIE irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 26 Sep 2019
Writeup from MB 108:

Northwest Africa 12768 (NWA 12768)


Purchased: September 2017

Classification: Iron meteorite (IIE)

History: A single 55 g stone purchased from a dealer in Alnif in September 2017.

Physical characteristics: The main mass is irregularly shaped, approximately 2.5 × 5 × 3 cm, with a mottled dark and light brown exterior.

Petrography: (C. Herd, L. Tunney, and R. Bukatiuk, UAb) Optical and SEM examination of a 1 × 2.5 cm polished and etched slice, as well as images of etched surfaces provided by the owner, show a well-developed micro-Widmanstatten pattern. Kamacite lamellae average 26±10 μm in width (n=89), but are individually comprised of equant subgrains with 120 degree junctions, suggesting recrystallization. Larger crystal boundaries are apparent at the cm scale, bounded by ~30 μm-wide kamacite lamellae. Inclusions were sought but not found.

Geochemistry: (C. Herd and L. Tunney, UAb) ICP-MS data, using sample of North Chile (Filomena) as standard: Ni = 8.8, Co = 0.47 (both wt%); Ir = 4.5, Ga = 25, Ge = 76, As = 14, W = 1.2, Re = 0.47, Pd = 3.9, Pt = 10, Cu = 316, Au = 1.2 (all µg/g).

Classification: Iron, IIE, finest octahedrite.

Specimens: Type specimen of 11.6 g at UAb. Main mass with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Alnif
Date:P September 2017
Mass (g):54.9
Class:Iron, IIE
Shock stage:low
Weathering grade:low
Classifier:C. Herd and L. Tunney, UAb
Type spec mass (g):11.6
Type spec location:UAb
Main mass:F. Kuntz
Comments:Field number K389; 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 1887 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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