Macphersonite

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
 Environment:
Polymorph of leadhillite and susannite.
 IMA Status:
Approved IMA 1982
 Locality:
Leadhills, Lanarkshire, Scotland.
 Name Origin:
Named after Harry Gordon Macpherson (1925-), mineralogist at the Royal Scottish Museum, Edinburgh, Scotland.
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
white, pale amber brown, or colorless.
 Density:
6.5
 Diaphaniety:
Translucent to transparent
 Habits:
Tabular - Form dimensions are thin in one direction., Pseudo Hexagonal - Crystals show a hexagonal outline.,
 Hardness:
2.5-3 - Finger Nail-Calcite
 Luminescence:
Fluorescent, Short UV=strong yellow, Long UV=strong yellow.
 Luster:
Adamantine - Resinous
 Streak:
white
More details...