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Northwest Africa 13280
Basic information Name: Northwest Africa 13280
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13280
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 987 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 2 May 2020
Writeup from MB 109:

Northwest Africa 13280 (NWA 13280)

(Northwest Africa)

Purchased: 2019 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Mbark Arjdal in June 2019 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Complex breccia composed of crystalline debris from several different types of eucrite together with minor (< 10 vol.%) diogenitic orthopyroxene. Major minerals are exsolved and unexsolved low-Ca, predominantly pigeonitic pyroxenes (some more magnesian, others more ferroan) and calcic plagioclase with accessory augite, silica polymorph, ilmenite, Ti chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs24.3Wo2.7; Fs27.8Wo4.1; FeO/MnO = 25-29, N = 2), more magnesian low-Ca pyroxene (Fs34.7-39.4Wo4.5-8.4, FeO/MnO = 27-33, N = 3), more ferroan low-Ca pyroxene (Fs47.9-55.4Wo16.4-4.6, FeO/MnO = 29-33, N = 4), augite (Fs18.4Wo44.3, FeO/MnO = 25), fayalite (Fa75.3, FeO/MnO = 44), plagioclase (An89.4-92.0Or0.5-0.3, N = 3).

Classification: Eucrite (polymict breccia).

Specimens: 27.2 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2019 Jun
Mass (g):987
Shock stage:low
Weathering grade:low
Fayalite (mol%):75.3
Ferrosilite (mol%):24.3-27.8; 34.7-39.4; 47.9-55.4
Wollastonite (mol%):2.7-4.1; 4.5-8.4; 16.4-4.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):27.2
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 240; 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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