Tellurobismuthite is a telluride mineral: bismuth telluride (Bi₂Te₃). It crystallizes in the trigonal system. There are natural cleavage planes in the (0001) direction as the crystal is effectively lamellar (layered) in that plane. The Mohs hardness is 1.5 - 2 and the specific gravity is 7.815. It is a dull grey colour, which exhibits a splendent luster on fresh cleavage planes.