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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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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