Wiktionary
nekrasovite
n. (context mineralogy English) An isometric-hextetrahedral reddish brown mineral containing antimony, arsenic, copper, iron, sulfur, tin, vanadium, and zinc.
Wikipedia
Nekrasovite
See Nekrasov Cossacks for another meaning
Nekrasovite is a rare copper vanadium sulfosalt mineral with formula Cu V( Sn, As, Sb) S. It crystallizes in the isometric system and occurs as small grains in ore aggregates. It is a brown opaque metallic mineral with Mohs hardness of 4.5 and a specific gravity of 4.62.
It was first described in 1984 in the Khayragatsch ore deposit of eastern Uzbekistan and named for Russian mineralogist Ivan Yakovlevich Nekrasov (born 1929).