4 Photos
Breithauptite
Chemical Formula	NiSb
Species	Sulfides
Crystal System	Hexagonal
Mohs Scale	5
Specific Gravity	7.591-8.23
Color	Pale copper-red, may be with Purple tint
Streak	Reddish brown
Luster	Metallic
Diaphaneity	Opaque
Cleavage	None
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Crystals rare, thin tabular or needlelike, to 1 mm; arborescent, disseminated, massive
Geological Setting：In hydrothermal veins associated with other nickle and cobalt arsenides.

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 8.23.

It occurs in hydrothermal calcite veins associated with cobalt–nickel–silver ores.

It was first described in 1840 from the Harz Mountains, Lower Saxony, Germany and in 1845 for occurrences in the Cobalt and Thunder Bay districts of Ontario, Canada. It was named to honor Saxon mineralogist Johann Friedrich August Breithaupt (1791–1873).