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Northwest Africa 10558
Basic information Name: Northwest Africa 10558
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10558
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 14.3 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 298 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 26 Mar 2016
Writeup from MB 105:

Northwest Africa 10558 (NWA 10558)

(Northwest Africa)

Purchased: 2015 Jun

Classification: Martian meteorite (Shergottite)

History: Purchased by Stefan Ralew in June 2015 from a Moroccan dealer at the Ensisheim Show.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic texture with some preferred orientation of inequidimensional pyroxene and maskelynite grains. Composed of prismatic grains of zoned clinopyroxene (up to 4 × 0.6 mm in size) plus subordinate, smaller laths of maskelynite together with accessory ilmenite, ulvöspinel, merrillite (some with chlorapatite rims) and pyrrhotite. Rare inclusions of silica polymorph are present in pyroxene.

Geochemistry: Low-Ca pyroxene (Fs 30.9-41.6Wo11.5-8.8, FeO/MnO = 28-35, N = 4), high-Ca pyroxene (Fs22.2-36.4Wo33.8-35.7, FeO/MnO = 28-32, N = 4), maskelynite (An52.1-52.4Or1.3-1.2, N = 2). The compositional ranges for pyroxene are more limited than in most other shergottites. Hf and Nd isotopes (M. Righter and T. Lapen, UHou): analysis of clean whole rock cutting dust gave ε176Hf = -19.49 and ε143Nd = -9.04, indicating that this specimen has affinities to enriched shergottites (like Shergotty).

Classification: Martian (diabasic shergottite, enriched).

Specimens: 2.86 g including one polished thin section at UWB; main mass with Ralew.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2015 Jun
Mass (g):14.3
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):30.9-41.6; 22.2-36.4
Wollastonite (mol%):11.5-8.8; 33.8-35.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):2.86
Type spec location:UWB
Main mass:S. Ralew
Comments:RA15-8-1; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UHou: University of Houston, United States (institutional address; updated 27 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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