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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 120 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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