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Northwest Africa 15339
Basic information Name: Northwest Africa 15339
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15339
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 9.76 kg
Recommended:  Diogenite-pm    [explanation]

This is 1 of 60 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 4 Dec 2022
Writeup from MB 111:

Northwest Africa 15339 (NWA 15339)

(Northwest Africa)

Purchased: 2022 Mar

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Craig Zlimen and Mark Lyon in March 2022 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed predominantly of diogenitic orthopyroxene mineral clasts, some lithic diogenite clasts and minor (< 2 vol.%) lithic eucrite clasts (with fine-intergranular and gabbroic textures). Some but not all diogenitic orthopyroxene exhibits undulose extinction. Other minerals are exsolved pigeonite, calcic plagioclase, and accessory silica polymorph, medium-Ti chromite, ilmenite, troilite and kamacite. Some orthopyroxene in exsolved pigeonite exhibits reverse compositional zoning. Also present are some symplectitic intergrowths of augite with troilite and kamacite.

Geochemistry: Diogenitic orthopyroxene (cores Fs22.8-23.4Wo1.9, FeO/MnO = 27-29, N = 2; rims Fs31.5-32.6Wo1.8-1.9, FeO/MnO = 29-31, N = 2; Fs29.7Wo1.6, FeO/MnO = 30), eucritic orthopyroxene hosts (Fs39.0-45.7Wo2.5-2.7, FeO/MnO = 24-29, N = 2), eucritic augite exsolution lamellae (Fs16.3-19.9Wo43.8-41.9, FeO/MnO = 21-23, N = 2), zoned eucritic orthopyroxene host (core Fs44.0Wo4.1, FeO/MnO = 31; rim Fs32.8Wo2.5, FeO/MnO = 33), augite in symplectite (Fs15.9Wo43.5, FeO/MnO = 19), augite (Fs13.3Wo45.7, FeO/MnO = 26), plagioclase (An78.9-88.4Or1.3-0.5, N = 4).

Classification: Diogenite (polymict breccia).

Specimens: 58 g including one polished thin section at UWB; remainder with Mr. C. Zlimen and Mr. M. Lyon.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2022 Mar
Mass (g):9760
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):22.8-23.4; 29.7-32.6; 39.0-45.7; 16.3-19.9
Wollastonite (mol%):1.9; 1.6-1.9; 2.7-2.5; 43.8-41.9
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):58
Type spec location:UWB
Main mass:C. Zlimen and M. Lyon
Comments:Work name ZLI 077; 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. 111, in preparation (2022)
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     This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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