Galena

Formula	PbS
Origin	Boltsburn Mine (Great Britain)
Description	idiomorphic, dark grey galenite crystal on limestone matrix
Classification (Lapis)	Sulfides
Crystal System	cubic
Hardness	2,0 – 3,0
Colour	Lead-gray; in polished section, white
Streak	Lead-gray
Luminescence	none observed
Lustre	Metallic
Transparency (Opacity)	opaque
Cleavage	perfect
Fracture	subconchoidal
Magnetism	negative
Geological Setting	In many different types of environments
Specific Gravity	7,57 g/cm3