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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
Recommended:  Achondrite-ung    [explanation]

This is 1 of 135 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 Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 97 approved meteorites from Mali (plus 2 unapproved names)

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