Crystal Form:Falke and plate

Habit: Massive, foliated or earthy form

Hardness:1-2

Cleavage/fracture:{0001}cleavage:perfect, basal

Luster:sub-metallic

Color: Black

Streak: Black

Specific Gravity:2.1-2.3

Other Characteristics:

(1)Good electric conductivity

(2)greasy, easily marking on fingers, brilliant

(3)Opaque(4)Soft but flaky