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Northwest Africa 13855
Basic information Name: Northwest Africa 13855
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13855
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 2.55 kg
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 119 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 8 Apr 2021
Writeup from MB 110:

Northwest Africa 13855 (NWA 13855)


Find: 2019

Classification: Iron meteorite (IAB-MG)

History: Collected by a nomad in an undetermined location in eastern central Algeria during the winter of 2019. Purchased by Geologist Juan Avil├ęs Poblador in Spring 2019 on behalf of UAlic.

Physical characteristics: The meteorite is approximately 13 × 10 × 5 cm. Most of the outer surface is a metallic gray, with minor dark red-brown rust spots. The exterior surface is highly irregular and pitted with no fusion crust or regmaglypts present. Several cm-scale dark inclusions are apparent on most surfaces. The exterior surface texture suggests significant wind erosion and weathering.

Petrography: (J. Poblador, UAlic and C. Herd, UAb): SEM and hand specimen observations show sub-cm, equant kamacite grains with minor taenite laths. No inclusions were observed on cut surfaces but the cm-scale dark inclusions visible on the exterior surface are likely troilite. Weathering extends along grain boundaries into the interior.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd, P. Hill, and S. DuFrane UAb): Ni = 6.5, Co = 0.46 (both wt%); Ir = 3.8, Ga = 90, Ge = 421, As = 11, Sb = 0.30, W = 1.2, Ru = 7.0, Re = 0.35, Os = 3.6, Pt = 8.3, Cu = 159, Au = 0.98 (all μg/g). Au value is a minimum due to uncertainties associated with the solution ICP-MS method.

Classification: (C. Herd, UAb): IAB iron, most likely MG when uncertainties on Au values are taken into account.

Specimens: Type specimen consisting of a 31.6 g representative slice at UAb. Main mass with Juan Poblador, 500 g with Sean Mchoney, 100 g with Topher Spinnato.

Data from:
  Table 0
  Line 0:
Mass (g):2553
Class:Iron, IAB-MG
Weathering grade:moderate
Classifier:C. Herd, UAb
Type spec mass (g):36.3
Type spec location:UAb
Main mass:UAlic
Comments:Field Number Iron#6; 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)
UAlic: Earth Sciences Department University of Alicante San Vicente del Raspeig, Spain (institutional address; updated 9 Feb 2020)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 1213 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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