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Northwest Africa 13351 | |||||||||||||||||||||||||||||||
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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: |
This is 1 of 142 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 7 Jul 2020 | ||||||||||||||||||||||||||||||
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: MB109 Table 0 Line 0: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
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