NiSTrigonal
Millerite
NiS
SulfidesChemical FormulaNiS
Crystal SystemTrigonal
Mohs Hardness3.5
Specific Gravity5.5
ColorBrass yellow to bronze
LusterMetallic
StreakGreenish black
CleavageTwo directions
FractureUneven
Occurrence
Found in hydrothermal veins and cavities. Nickel ore. Hair-like crystals.