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Northwest Africa 13359
Basic information Name: Northwest Africa 13359
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13359
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 96 g
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 383 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Jul 2020
Writeup from MB 109:

Northwest Africa 13359 (NWA 13359)

(Northwest Africa)

Purchased: 2020 Mar

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by John Divelbiss in March 2020 from Matthew Stream, who bought the stone from a Moroccan dealer at the 2020 Tucson Gem and Mineral Show.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex breccia composed of angular mineral clasts of both exsolved and unexsolved pigeonite, augite and anorthite together with <10 vol.% diogenitic orthopyroxene (exhibiting undulose extinction) plus minor olivine, silica polymorph and more ferroan orthopyroxene set in a finer grained matrix containing chromite, ilmenite, Ni-free metal, kamacite, calcite and barite. Sparse lithic clasts of gabbroic eucrite and genomict breccia clasts are also present in the studied thin section. Most grains of anorthite and pigeonite exhibit recrystallization into very fine grained, polygranular aggregates.

Geochemistry: Pigeonite host (Fs51.6-55.8Wo5.1-8.7, FeO/MnO = 30-31, N = 4), augite exsolution lamellae (Fs28.4-29.8Wo39.0-40.2, FeO/MnO = 30, N = 2), orthopyroxene (Fs40.4Wo2.5, FeO/MnO = 29), pigeonite (core Fs39.2Wo7.7; rim Fs41.2Wo15.5; FeO/MnO = 30-31; N = 2), augite Fs29.8Wo39.0, FeO/MnO = 30), anorthite (An92.2-94.8Or0.1-0.3, N = 3), diogenitic orthopyroxene (Fs26.5-29.9Wo1.8-3.5; rim Fs33.6Wo3.8; FeO/MnO = 27-32, N = 4), olivine (Fa27.1-34.5, FeO/MnO = 48-51, N = 4).

Classification: Eucrite (polymict breccia).

Specimens: 20.6 g including one polished thin section and one polished slice at UWB; remainder with Mr. J. Divelbiss.

Data from:
  Table 0
  Line 0:
Place of purchase:Riverside, California
Date:P 2020 Mar
Mass (g):96
Shock stage:high
Weathering grade:low
Fayalite (mol%):27.1-34.5
Ferrosilite (mol%):26.6-33.6; 51.6-55.8; 28.4-29.8
Wollastonite (mol%):1.8-3.8; 5.1-8.7; 39.0-40.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.6
Type spec location:UWB
Main mass:J. Divelbiss
Comments:Work name JD20-2; 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. 109, in preparation (2020)
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     This is 1 of 8744 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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