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 % PbCarbon 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:whiteMore details...

Pb4(SO4)(CO3)2(OH)2