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Northwest Africa 15061
Basic information Name: Northwest Africa 15061
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15061
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 5.72 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Winonaite
MB 113  (2024)  Achondrite-prim-ung
Recommended:  Achondrite-prim-ung    [explanation]

This is 1 of 8 approved meteorites classified as Achondrite-prim-ung.   [show all]
Search for other: Primitive achondrites, Ungrouped achondrites
Comments: Approved 5 Jul 2022
Revised 11 Jan 2024: reclassified
Writeuphelp
Writeup from MB 111:

Northwest Africa 15061 (NWA 15061)

Mali

Purchased: 2022 Mar

Classification: Primitive achondrite (Winonaite)

History: Reportedly found by Saharawi meteorite hunters in an area called Unan (~120 km SE of Taoudenni), Mali, in February 2022.

Petrography: (K. Metzler, IfP) Achondrite with metamorphic texture, showing frequent 120° triple junctions and partly poikilitic intergrowths. It consists of olivine, low-Ca pyroxene, Ca-rich pyroxene, plagioclase, and Fe-Ni metal. Much of the latter is terrestrially oxidized, forming veins of alteration products along grain boundaries and crosscutting mineral grains. Typical grain sizes are between 200 and 500 µm, but low-Ca pyroxene grains up to several mm occur. Accessories are troilite and daubréelite.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa1.2±0.1 (Fa1.0-1.4; n=9). The mean low-Ca pyroxene composition is Fs1.4±0.3Wo0.8±0.1 (Fs0.9-1.8Wo0.5-0.9; n=11). The mean composition of Ca-rich pyroxene is Fs0.9±0.3Wo40.9±0.5 (Fs0.5-1.4Wo40.3-41.6; n=10). The mean feldspar composition is An36.5±2.0Or0.1±0.1 (An32.1-38.6Or0.0-0.4; n=10).

Classification: Winonaite, based on texture, mineral chemistry and high abundance of Fe-Ni metal.

Specimens: 3292 g owned by Mohamed Ali Loud (largest piece 385 g). 2430 g owned by Miguel Ángel Contreras Gómez.


Writeup from MB 113:
NWA 15061, reclassification
This meteorite is reclassified (K. Metzler, IfP) as an ungrouped primitive achondrite, likely paired with Bir Ounane 001. Oxygen isotopes, obtained by laser fluorination (T. Di Rocco, UGött) are: δ18O= 5.710; δ17O= 1.709; Δ17O= -1.298 (permil). The two meteorites have similar textures and mineral compositions (Fa~1.2, Fs~1.4Wo~0.8).
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2022 Mar
Mass (g):5722
Pieces:97
Class:Winonaite
Shock stage:M-S1
Weathering grade:high
Fayalite (mol%):1.2±0.1
Ferrosilite (mol%):1.4±0.3; 0.9±0.3
Wollastonite (mol%):0.8±0.1; 40.9±0.5
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Mohamed Ali Loud
Comments:Submitted by K. Metzler, IfP
Plots: O isotopes:  
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
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. ?
Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Chunliang Zhang               
Cyril Chedoz   
Domjan Svilkovic   
Guchen Chen   
Qi Lv      
Sans   
Public domain photographs:
Knut Metzler   
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 122 approved meteorites from Mali (plus 2 unapproved names)

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