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Northwest Africa 12893 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12893 This is an OFFICIAL meteorite name. Abbreviation: NWA 12893 Observed fall: No Year found: 2018 Country: Mauritania Mass: 56.1 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 79 approved meteorites classified as L6-melt breccia. [show all] Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Oct 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12893 (NWA 12893) Mauritania Purchased: 2018 Classification: Ordinary chondrite (L6, melt breccia) History: Purchased online in 2018 by Daniel Sheikh from Matthew Stream, who had purchased it in 2017 from a seller in Mauritania. Physical characteristics: Single stone with dark-brown fusion crust. Interior slice reveals brecciated texture. Petrography: (Daniel Sheikh, FSU) Sample is a breccia composed of angular clasts (up to 2.5 cm) set in a shock melted matrix. Major phases present include olivine, low-ca pyroxene, high-ca pyroxene, sodic plagioclase (Av. 60 μm), kamacite, taenite, and troilite. Accessory chromite is present as well. A few of the clasts contain relict chondrule (BO and RP) fragments. Geochemistry: (Daniel Sheikh, FSU) Olivine (Fa24.8±0.6, n=87), low-Ca Pyroxene (Fs21.1±0.6Wo1.4±0.2, n=48), high-Ca Pyroxene (Fs8.5±0.7Wo43.7±0.7, n=11), Sodic Plagioclase (An11.3±0.6, n=43), Chromite (Cr/(Cr+Al)=85.5±0.2, n=4). Classification: Ordinary chondrite (L6-melt breccia) Specimens: 16.83 grams at UCLA; main mass with Daniel Sheikh. | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 220 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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