1) Antimonide mineral 2) Hexagonal mineral 
Breithauptite is a nickel antimonide mineral with the simple formula NiSb. Breithauptite is a metallic opaque copper-red mineral crystallizing in the hexagonal - dihexagonal dipyramidal crystal system. It is typically massive to reniform in habit, but is observed as tabular crystals. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 8.2...
(from the article `antimonide`) ...platinum, pyrrhotite, and chalcopyrite. It has been found in the Bushveld Complex, S.Af., at Kambalda, W.Aus., and at Norilsk, Russia. Other ...
Nickel antimonide