Wherryite

General Information:
 Chemical Formula:
Pb7Cu2(SO4)4(SiO4)2(OH)2
 Composition:
(Molecular Weight = 2,243.47 gm)
Silicon 2.50 % Si
Copper 8.50 % Cu
Hydrogen 0.09 % H 
Lead 64.65 % Pb
Sulfur 5.72 % S 
Oxygen 18.54 % O 
 Empirical Formula:
Pb7Cu3(SO4)4(SiO4)2(OH)2
Physical Properties:
 Color:
yellow green, light green, or light yellow.
 Density:
6.45
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