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Northwest Africa 13351
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:help 4.87 kg
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 99 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 7 Jul 2020
Writeuphelp
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:
  MB109
  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
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
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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