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Northwest Africa 15189 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15189 This is an OFFICIAL meteorite name. Abbreviation: NWA 15189 Observed fall: No Year found: 2021 Country: Mauritania Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 400 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 6 Aug 2022 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 15189 (NWA 15189) Ouargla, Mauritania Find: Oct 2021 Classification: HED achondrite (Eucrite, polymict) History: TKW: 516g - 5 individual Stones. Found: Ouargla, Algeria early 2021 by anonymous finder. Purchased in Algeria by Younes Chaoui in october 2021. Purchased by Gemma Thomas from Younes Chaoui March 2022 and sent for classification at UPlym. Physical characteristics: Five weathered stones with some pale crystals visible at the surface. The sample does not preserve a fusion crust, and instead displays desert varnish across the majority of each stone. Petrography: Polymict eucrite breccia with at least three distinct basaltic eucritic lithologies preserved, composed predominantly of plagioclase (48.5 vol%), low-Ca pyroxene (31.0 vol%), and high Ca-pyroxene (15.4 vol%), with accessory silica phase (3.0 vol%), troilite, chromite, ilmenite, Fe-metal, and zircon. A minor amount of diogenitic pyroxene (Fs<32, <10 vol%) entrained in the matrix. Clasts are relatively rounded and measure up to 5.4 mm in size. Matrix preserves abundant areas of melt with fine dendritic intergrowths of pyroxene and plagioclase. Ca-weathering products infill fractures and barite is present throughout. Geochemistry: Low-Ca pyroxene Fs33.3-67.3Wo1.7-9.2, mean Fs59.1±6.9Wo4.0±1.9 (n = 95). High-Ca pyroxene Fs18.6-69.3Wo12.0-44.4, mean Fs34.8±9.9Wo34.9±10.1 (n = 100). Plagioclase An77.3-96.7Or0.0-10.2, mean An92.4±2.9Or1.1±1.5 (n = 86). Chromite Chm55.5-81.4Usp5.6-37.4, mean Chm72.0±8.0Usp17.6±10.3, Cr#87.6 (n=18). Fe/Mn = 32.1. Classification: Eucrite Polymict Specimens: 5 individuals including type specimen. Type specimen 22 g with UPlym. Main mass is with main mass holder Gemma Thomas 4 stones: 132, 99, 110, and 150 g | ||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Institutions and collections |
USP: Museu de Geociências - USP
Rua do Lago, 562
CEP: 05508-080
Butantã - SP
Brazil, Brazil; Website (institutional address; updated 22 Oct 2022) UPlym: University of Plymouth, United Kingdom; Website (institutional address; updated 29 Oct 2022) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Photos: |
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Geography:![]() |
Statistics: This is the only approved meteorite from Ouargla, Mauritania This is 1 of 212 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) |