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Northwest Africa 14269
Basic information Name: Northwest Africa 14269
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14269
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 2.85 kg
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Nov 2021
Writeup from MB 110:

Northwest Africa 14269 (NWA 14269)

(Northwest Africa)

Purchased: 2021 Apr

Classification: Martian meteorite (Shergottite)

History: Purchased by Mark Lyon and Craig Zlimen in April 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture with some preferred orientation of prismatic, zoned clinopyroxene grains (up to 2 mm) and lath-like maskelynite grains (up to 1.5 mm). Accessory phases include pyrrhotite (some stained), ulvöspinel (with variable Cr contents), ilmenite, silica polymorph, K-feldspar, merrillite and minor baddeleyite. Some small melt pockets containing "swirly" vesicular glass are present.

Geochemistry: Subcalcic augite cores (Fs21.1-25.2Wo33.0-35.2, FeO/MnO = 25-30, N = 3), ferroan pigeonite rims (Fs51.2-62.9Wo12.8-15.4, FeO/MnO = 37-38, N = 3), ferropigeonite (Fs72.0Wo7.7, FeO/MnO = 36), maskelynite (An50.7-53.6Or1.4-2.1, N = 3), K-feldspar (Or62.9Ab26.7An10.4).

Classification: Shergottite (aphyric, diabasic). Likely paired with NWA 12262 and other such stones.

Specimens: 26.9 g including one polished thin section at UWB; remainder with Mr. M. Lyon and Mr. C. Zlimen.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Apr
Mass (g):2850
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):21.1-25.2; 51.2-62.9
Wollastonite (mol%):33.0-35.2; 12.8-15.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):26.9
Type spec location:UWB
Main mass:M. Lyon/C. Zlimen
Comments:Work name ZLI037; 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)
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 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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