
1) Cubic mineral 2) Vanadium mineral
Found on
https://www.crosswordclues.com/clue/nekrasovite

Nekrasovite is a rare copper vanadium sulfosalt mineral with formula Cu26V2(Sn,As,Sb)6S32. 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 Uz...
Found on
http://en.wikipedia.org/wiki/Nekrasovite
No exact match found.