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Northwest Africa 13686 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13686 This is an OFFICIAL meteorite name. Abbreviation: NWA 13686 Observed fall: No Year found: 2020 Country: Mauritania Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 38 approved meteorites classified as R5. [show all] Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 28 Mar 2021 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13686 (NWA 13686) Mauritania Purchased: 2020 Classification: Rumuruti chondrite (R5) History: Carlos Muñecas purchased the 341 g sample from a dealer in Mauritania. Physical characteristics: Sample is partially coated with a dark contraction-cracked fusion crust. The cut face shows the interior is a breccia composed of light grey irregular-shaped recrystallized clasts and dark-gray host with visible chondrules and fine-grained dispersed sulfides. Petrography: Description and classification (A. Love, App) Sample is a breccia composed of recrystallized chondritic clasts surrounded by a brecciated host of similar materials. Sulfides within recrystallized clasts are coarsely crystalline, while sulfides within host are finely disseminated. Average apparent diameter of chondrules is 411 µm, n=58. Plagioclase occurs in distinct isolated intergrowths. Additional minerals are: Ti-bearing chromite, abundant pentlandite, FeS and apatite. Geochemistry: Olivine (Fa39.1±0.3, Fe/Mn=70.5±2.8, n=20); low Ca pyroxene (Fs31.1±0.3Wo1.7±0.7, Fe/Mn=47.4±1.9, n=9); high Ca pyroxene (Fs12.4±0.5Wo43.0±1.1, Fe/Mn=42.9±3.5, n=10). Classification: Rumuruti chondrite (R5 breccia, C-S3, wi-0) Based on ubiquitous sulfides and equilibrated compositions of olivine and pyroxene, sample is an R5 breccia. Specimens: Carlos Muñecas holds the main mass. Two slices weighing 20.08 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 175 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters) |