General Information:
Chemical Formula:
Pb4(SO4)(CO3)2(OH)2
Composition:
(Molecular Weight = 1,078.90 gm)
Hydrogen 0.19 % H
Lead 76.82 % Pb
Carbon 2.23 % C
Sulfur 2.97 % S
Oxygen 17.80 % O
Empirical Formula:
Pb4(SO4)(CO3)2(OH)2
Name Origin:
Named after its source in Leadhills, Scotland.
Physical Properties:
Cleavage:
[001] Perfect, [100] Indistinct
Color:
colorless, gray, yellowish, white, or light blue.
Density:
6.26 - 6.55, Average = 6.4
Diaphaniety:
Transparent to translucent
Habits:
Pseudo Hexagonal - Crystals show a hexagonal outline., Tabular - Form dimensions are thin in one direction., Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
2.5 - Finger Nail
Luminescence:
None.
Luster:
Adamantine
Streak:
white
More details...