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Northwest Africa 13925
Basic information Name: Northwest Africa 13925
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13925
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1250 g
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 May 2021
Writeup from MB 110:

Northwest Africa 13925 (NWA 13925)

(Northwest Africa)

Purchased: 2020 Jan

Classification: Martian meteorite (Shergottite)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Poikilitic texture. Pyroxene oikocrysts (with domains of low-Ca pyroxene, pigeonite and subcalcic augite) enclosing olivine chadacrysts are set in a sparse interstitial groundmass composed mainly of clinopyroxene and maskelynite plus accessory pyrrhotite, ilmenite, chromite, merrillite and minor secondary calcite. Olivine chadacrysts contain crystallized melt inclusions consisting of aluminous augite, plagioclase, silica polymorph and pyrrhotite.

Geochemistry: Olivine (Fa31.5-36.9, FeO/MnO = 46-52, N = 8), low-Ca pyroxene (Fs20.3-20.9Wo2.7-3.2, FeO/MnO = 31, N = 2), pigeonite (Fs24.6-28.0Wo7.4-15.6, FeO/MnO = 27-30, N = 4), subcalcic augite (Fs16.2-17.8Wo29.2-31.8, FeO/MnO = 24, N = 2), maskelynite (An55.6-56.7Or1.1-1.3, N = 3).

Classification: Shergottite (poikilitic). Likely paired with NWA 13250, NWA 13276, NWA 13360, NWA 13366, NWA 13367, and NWA 13369, based on closely similar textures and mineral compositions.

Specimens: 20.5 g in the form of a polished endcut at UWB; remainder with Mr. L. Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Jan
Mass (g):1250
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):31.5-36.9
Ferrosilite (mol%):20.3-20.9; 24.6-28.0; 16.2-17.8
Wollastonite (mol%):2.7-3.2; 7.4-15.6; 29.2-31.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.5
Type spec location:UWB
Main mass:L. Labenne
Comments:Work name LAB21-6; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
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 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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