Ashburtonite

General Information:
 Chemical Formula:
HPb4Cu++4Si4O12(HCO3)4(OH)4Cl
 Composition:
(Molecular Weight = 1,735.88 gm)
Copper 14.64 % Cu
Silicon 6.47 % Si
Hydrogen 0.52 % H 
Lead 47.75 % Pb
Carbon 2.77 % C 
Chlorine 2.04 % Cl
Oxygen 25.81 % O 
 Empirical Formula:
HPb4Cu4Si4O12(HCO3)4(OH)4Cl
 IMA Status:
Approved IMA 1989
Physical Properties:
 Cleavage:
None
 Color:
blue.
 Density:
4.69
 Diaphaniety:
Transparent
 Luster:
Vitreous (Glassy)
 Streak:
light blue
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