Kobellite

Formula:  Pb₂₂Cu₄(Bi,Sb)₃₀S₆₉

Origin of name:  For W. von Kobell, German mineralogist

Crystal system:  Orthorhombic

Crystal class:  2/m

Twinning: 

Unit cell: 

Colour:  Blackish gray to steel gray

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Crystals prismatic; massive, fibrous or radiated; fine granular

Hardness:  2.5 to 3

Specific gravity:  6.48

Cleavage:  1; {010} distinct

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Series with tintinaite