Cobaltite

Formula: CoAsS

Colour: Reddish silver white, violet steel gray, or black.

Lustre: Metallic

Hardness:

Specific Gravity: 6.33

Crystal System: Orthorhombic

Member of: Cobaltite Group. Cobaltite-Gersdorffite Series.

Name: From the German, Kobold, “underground spirit” or “goblin,” in allusion to the refusal of cobaltiferous ores to smelt properly, hence “bewitched.”