This is 1 of only 8 Meteorite approved as Achondrite-Primitive-Ungrouped. NWA 15061 - 26.26 g - (1)

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.