NWA 13351

 

NWA 13351

Found Sahara, 2020

Achondrite

Achondrite-Ungrouped

Specimen is a 3.30g slice



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Basic information Name: Northwest Africa 13351 This is an OFFICIAL meteorite name.
Abbreviation: NWA 13351
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 4.87 kg
Classification history: Meteoritical Bulletin, MB 109 (2021): Achondrite-ung
Recommended: Achondrite-ung   
Writeup Writeup from MB 109:

Northwest Africa 13351 (NWA 13351)

(Northwest Africa)

Purchased: 2020 May

Classification: Ungrouped achondrite

History: A batch of 31 identical appearing stones collected at the same location as the NWA 13272 stone was purchased from the same Mauritanian dealer by Rachid and Jaouad Chaoui im May 2020.

Physical characteristics: Like the NWA 13272 stone, these dark brown stones (total weight 4870 g) have a distinctive "knobby" exterior surface with shiny desert patina. Cut and polished interior surfaces exhibit only rare tiny grains of metal.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fine grained with a poikilitic igneous texture. Composed predominantly of compositionally zoned pyroxene oikocrysts (with domains of orthopyroxene, pigeonite and subcalcic augite) enclosing chadacrysts of olivine, together with interstitial devitrified silicic glass plus accessory troilite, pyrrhotite, chromite, very rare kamacite (extensively altered to Fe hydroxides) and secondary barite.

Geochemistry: Olivine (Fa23.9-26.7, N = 5), orthopyroxene (Fs17.3-18.0Wo1.2-2.3, N = 3), pigeonite (Fs18.1-19.7Wo13.8-8.5, N = 2), subcalcic augite (Fs12.8-15.5Wo32.1-36.2, N = 3), interstitial glass (SiO2 69.7 wt.%, Al2O3 20.1 wt.%, Na2O 1.0 wt.%, K2O 0.57 wt.%, P2O5 0.54 wt.%).

Classification: Achondrite (ungrouped, igneous). Paired with NWA 13272.

Specimens: 25.5 g in the form of a polished endcut at UWB; remainder held jointly by Mr. R. Chaoui and Mr. J. Chaoui.

 

Data from: MB114
Table 0 Line 0:
Place of purchase: Mauritania
Date: P 2020 May
Mass (g): 4870
Pieces: 31
Class: Achondrite-ung
Shock stage: low
Weathering grade: low
Fayalite (mol%): 23.9-26.7
Ferrosilite (mol%): 17.3-18.0; 18.1-19.7; 12.8-15.5
Wollastonite (mol%): 1.2-2.3; 13.8-8.5; 32.1-36.2
Magnetic suscept.: 3.50
Classifier: A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g): 25.5
Type spec location: UWB
Main mass: R. Chaoui/J. Chaoui
Comments: Work name RC131.2; submitted by A. Irving
Institutions and collections
  UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 2023-10-09)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 2012-01-15)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 2011-10-17)

About Us

The WWMeteorites team (for "WorldWide Meteorites" - Meteorites from around the world) was created in 2003 with the primary goal of traveling around globe in search of these fascinating celestial objects, and make them available for Science... and Collectors. Since 2017, the team has established its base camp on the island of Unst (Shetland, UK).

With four or five trips per year on average, the number of finds (in countries as diverse as Tunisia, Spain, Qatar, the Sultanate of Oman ...) has quickly become important. WWMeteorites therefore collaborates with several laboratories that analyze, and classify the new meteorites, mainly the Museum Fur Naturkunde (Berlin), the CEREGE (University of Aix-Marseille), and the Appalacjain State University (North Carolina). WWmeteorites (under the name of its founder, Fabien Kuntz.)  have already more than 500 meteorites listed in the Meteoritical Society Database.

In order to have a classification and an official referencement established, as well as to allow the long-term research on the meteorites, a part of 20% of each find by WWmeteorites is deposited in a lab
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