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Northwest Africa 15917
Basic information Name: Northwest Africa 15917
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15917
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 222 g
Meteoritical Bulletin:  MB 112  (2023)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 322 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 7 May 2023
Writeup from MB 112:

Northwest Africa 15917 (NWA 15917)

(Northwest Africa)

Purchased: 2020 Apr

Classification: Martian meteorite (Shergottite)

History: Purchased by Luc Labenne in April 2020 from a Moroccan dealer.

Petrography: (A. Irving, UWS; P. Carpenter, WUSL; G. Motta, A. Ostwald, S. Ramsey and A. Udry, UNLV):Diabasic subophitic texture. Composed mainly of patchily zoned, prismatic clinopyroxene grains (51.3 vol.%; up to 2.5 mm in length) and lath-like grains of maskelynite (41.7 vol.%) together with relatively abundant merrillite (6.5%) and minor ilmenite, silica polymorph, fayalite, baddeleyite and pyrrhotite. Pyroxene compositions include pigeonite, subcalcic augite and ferropigeonite (predominantly at grain rims).

Geochemistry: Pigeonite cores (Fs27.0-56.5Wo8.7-19.6, FeO/MnO = 28-39, N = 38), subcalcic augite cores (Fs19.3-48.7Wo240.0-36.8, FeO/MnO = 26-40, N = 29), ferropigeonite rims (Fs53.6-84.9Wo8.4-17.9, FeO/MnO = 33-51, N = 61), maskelynite (An56.5-67.5Or0.1-0.6, N = 36), fayalite (Fa98.4, FeO/MnO = 47).

Classification: Shergottite (diabasic).

Specimens: 21.2 g including a polished thin section and a polished mount at UWB; remainder with Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Apr
Mass (g):222
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):98.4
Ferrosilite (mol%):27.0-81.8; 28.4-33.7
Wollastonite (mol%):11.2-18.7; 24.6-31.8
Classifier:A. Irving, UWS, P. Carpenter, WUSL, and A. Udry, UNLV
Type spec mass (g):21.2
Type spec location:UWB
Main mass:Labenne
Comments:Work name SB 100; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
UNLV: Department of Geoscience University of Nevada 4505 S Maryland Pkwy Las Vegas, NV 89154-4010, United States (institutional address; updated 2 Dec 2018)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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