PbS

Non-silicate

Crystal system: cubic

Colour in hand specimen: lead grey
Streak: lead grey
Lustre: metallic
Cleavage: one, perfect
Hardness: 2.5

Colour in plane polarised light: opaque
Relief: high

M412 Quartz (with galena and pyrite) 
North Wales 
A mass of small hexagonal quartz prisms, with galena, pyrite and zinc blende. 
Transparent, white to light grey 
Galena: purple-black, shiny, platy habit, metallic 
Pyrite: metallic lustre, gold colour, cubic habit, “Fools’ gold”