Lead Copper Hydroxy Sulfate
PbCu[(OH)2|SO4]
Chemical name
Lead Copper Hydroxy Sulfate
Mineral name
Linarite
Chemical formula
PbCu[(OH)2|SO4]
Crystal system
monoclinic
Crystal Class
monoclinic-prismatic (2/m)
Space Group
P2_1/m
Unit cell
a [Å]:9.81
b [Å]:5.65
c [Å]:4.70
Formula units
Z=2
Twinning
common on {100}, also {001}
Mohs hardness
2.5
Density [g/cm3]
5.3 - 5.5
Cleavage
perfect on {100}, imperfect on {001}
Fracture / Tenacity
conchoidal
Color
deep azure blue
Streak
pale blue
Transparency
transparent to translucent
Optical character
biaxial (-)
Refractive Index
nα=1.809; nβ=1.838; nΥ=1.859
Birefringence δ
0.050
Pleochroism δ
moderate