Lead Sulfide
PbS
Chemical name
Lead Sulfide
Mineral name
Galena
Chemical formula
PbS
Melting point [°C]
1114
Crystal system
cubic
Crystal Class
cubic-hexoctahedral (4/m -3 2/m)
Space Group
Fm-3m
Unit cell
a [Å]:5.94
b [Å]:5.94
c [Å]:5.94
Formula units
Z=4
Frequent crystal surfaces
{100}, {111}, {110}, {221}
Twinning
on {111}
Mohs hardness
2.5 - 3
Density [g/cm3]
7.2 - 7.6
Cleavage
perfect on {100}
Fracture / Tenacity
brittle, subconchoidal
Color
lead gray, silvery
Streak
lead gray
Transparency
opaque
Optical character
isotropic