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Northwest Africa 13274
Basic information Name: Northwest Africa 13274
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13274
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 256 g
Recommended:  Achondrite-ung    [explanation]

This is 1 of 119 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 2 May 2020
Writeup from MB 109:

Northwest Africa 13274 (NWA 13274)

(Northwest Africa)

Purchased: 2019

Classification: Ungrouped achondrite

History: Purchased by Mark Lyon in December 2019 and January 2020 from two separate Moroccan dealers.

Physical characteristics: A total of eight similar-appearing brown stones (combined weight 255.5 g).

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Analysis of two different stones shows this material to be composed predominantly of larger grains (mean size ~0.6 mm) of finely-exsolved low-Ca and high-Ca pyroxenes plus polygranular calcic plagioclase, together with accessory silica polymoprh, ferroan olivine, merrillite, chromite, ilmenite, Cr ulvöspinel, troilite and pentlandite (stained).

Geochemistry: Low-Ca pyroxene (Fs62.2-63.6Wo6.3-6.8, FeO/MnO = 60-65, N = 6), high-Ca pyroxene (Fs34.8-35.9Wo38.1-39.1, FeO/MnO = 60-69, N = 5), olivine (Fa72.1-82.0, FeO/MnO = 90-100, N = 4), plagioclase (An84.8-88.2Or0.3, N = 3).

Classification: Achondrite (ungrouped). Paired with NWA 011, NWA 2400, NWA 2976, NWA 4587, NWA 4901 and NWA 8545.

Specimens: 20.7 g including one polished thin section at UWB; remainder with Mr. M. Lyon.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir; Tucson
Date:P 2019
Mass (g):255.5
Shock stage:low
Weathering grade:low
Fayalite (mol%):72.1-82.0
Ferrosilite (mol%):62.2-63.6; 34.8-35.9
Wollastonite (mol%):6.3-6.8; 38.1-39.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):20.7
Type spec location:UWB
Main mass:M. Lyon
Comments:Work name Lyon19-4; 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 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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