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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
Classification
  history:
Meteoritical Bulletin:  MB 109  (2021)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 160 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 2 May 2020
Writeuphelp
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:
  MB109
  Table 0
  Line 0:
Place of purchase:Agadir; Tucson
Date:P 2019
Mass (g):255.5
Pieces:8
Class:Achondrite-ung
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
Institutions
   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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jay Buscio   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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