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Northwest Africa 15201 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15201 This is an OFFICIAL meteorite name. Abbreviation: NWA 15201 Observed fall: No Year found: 2021 Country: Mali Mass: 1019 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 142 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 12 Nov 2022 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 15201 (NWA 15201) Mali Purchased: 2021 Classification: Ungrouped achondrite History: Purchased by Adam Aithiba in 2021. Reportedly found in Mali near Taoudenni. Physical characteristics: Single stone with scattered patches of black fusion crust. The exterior and broken surfaces show a very fine-grained mix of brown and dark gray minerals. Petrography: (C. Agee, UNM) Backscatter electron imaging and reflected light microscopy reveal an ophitic texture of augite, olivine, and plagioclase. Augites show igneous zoning. Accessory phases include ilmenite, titano-magnetite, and magnetite. Melt pockets are present, some with vesicles. Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa66.8±9.4, Fe/Mn=67±3, n=6; augite Fs31.7±11.1Wo32.5±3.4, Fe/Mn=43±4, n=6; plagioclase An60.0±5.2Ab38.7±4.9, n=4; fusion crust SiO2=53.1±1.7, TiO2=2.4±0.3, Al2O3=12.2±0.4, MgO=3.5±0.7, MnO=0.39±0.05, FeO=14.2±2.4, CaO=10.6±1.4, Na2O=1.2±0.4, K2O=1.8±0.5 (wt%), Fe/Mn=36±4, n=4. Oxygen isotopes (K. Ziegler, UNM): 2 acid-washed fragments analyzed by laser fluorination gave δ18O= 6.758, 7.049; δ17O= 3.493, 3.642; Δ17O= -0.075, -0.080 (linearized, all per mil, TFL slope=0.528). Classification: Ungrouped achondrite, basalt. The oxygen isotope values of this meteorite plot slightly below the terrestrial fractionation line (TFL) and its mineralogy and geochemistry are unlike lunar basalts. The Fe/Mn of olivine and augite of this specimen are similar to terrestrial basalts; however the presence of glassy fusion crust supports an ungrouped achondrite classification. Specimens: 26 g including a probe mount on deposit at UNM, Adam Aithiba holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||
Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: |
Statistics: This is 1 of 111 approved meteorites from Mali (plus 2 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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