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Northwest Africa 15201
Basic information Name: Northwest Africa 15201
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15201
Observed fall: No
Year found: 2021
Country: Mali
Mass:help 1019 g
Meteoritical Bulletin:  MB 111  (2023)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 155 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 12 Nov 2022
Writeup from MB 111:

Northwest Africa 15201 (NWA 15201)


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:
  Table 0
  Line 0:
Date:P 2021
Mass (g):1019
Shock stage:low
Weathering grade:low
Fayalite (mol%):66.8±9.4
Ferrosilite (mol%):31.7±11.1
Wollastonite (mol%):32.5±3.4
Classifier:C. Agee, UNM
Type spec mass (g):26
Type spec location:UNM
Main mass:Adam Aithiba
Comments:Fieldname ADA-28; submitted by C. Agee
Plots: O isotopes:  
   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)
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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     This is 1 of 122 approved meteorites from Mali (plus 2 unapproved names)

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