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
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