Physical properties
Habit: massive, granular, faces striated.
Color: reddish silver white, violet steel gray, or
black.
Diaphaneity: opaque.
Luster: metallic.
Streak: grayish black
Cleavage: {100} good,
{010} good, {001} good.
Fracture: uneven, brittle.
Electrical resistivity 6.5 to 130 mΩ.m.
