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Northwest Africa 13428
Basic information Name: Northwest Africa 13428
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13428
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 480 g
Recommended:  Diogenite-pm    [explanation]

This is 1 of 49 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 28 Sep 2020
Writeup from MB 109:

Northwest Africa 13428 (NWA 13428)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Nicholas Gessler in 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of angular mineral clasts in a very fine grained matrix. No polymineralic lithic clasts were observed in the studied thin section. The most abundant components are diogenitic orthopyroxene and subordinate olivine, together with <10 vol.% of eucritic low-Ca pyroxene, augite and calcic plagioclase. Accessory phases include silica polymorph, Ti-free chromite, kamacite, ilmenite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs23.9-25.3Wo2.1-3.3, FeO/MnO = 28-29, N = 3), olivine (Fa26.1-28.5, FeO/MnO = 45-49, N = 3), eucritic low-Ca pyroxene (Fs57.9-58.2Wo3.3-6.7, FeO/MnO = 29-33, N = 2), eucritic augite (Fs27.7-30.2Wo40.9-40.1, FeO/MnO = 32-34, N = 2), plagioclase (An83.6-91.6Or0.6-0.3, N = 4).

Classification: Diogenite (polymict breccia).

Specimens: 21.6 g plus one polished thin section at UWB; remainder with Mr. N. Gessler.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):480
Shock stage:low
Weathering grade:low
Fayalite (mol%):26.1-27.7
Ferrosilite (mol%):23.9-25.3; 57.9-58.2; 27.7-30.2
Wollastonite (mol%):2.1-3.3; 3.3-6.7; 40.9-40.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.6
Type spec location:UWB
Main mass:N. Gessler
Comments:Work name AB; 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)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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