Leadhillite

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 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:whiteMore details...