General Information:
Chemical Formula:
Pb2CuCl2(OH)4
Composition:
(Molecular Weight = 616.88 gm)
Copper 10.30 % Cu
Hydrogen 0.65 % H
Lead 67.18 % Pb
Chlorine 11.49 % Cl
Oxygen 10.37 % O
Empirical Formula:
2(Pb)2(OH)2CuCl2
Locality:
Higher Pitts, Mendip Hills, Somersetshire, England.
Name Origin:
From the Greek dia, "difference" and the mineral Boleite.
Physical Properties:
Cleavage:
[001] Perfect
Color:
dark blue or bright sky blue.
Density:
5.48 - 6.41, Average = 5.94
Diaphaniety:
Transparent to Translucent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Encrustations - Forms crust-like aggregates on matrix., Granular - Generally occurs as anhedral to subh edral crystals in matrix.
Hardness:
2.5 - Finger Nail
Luster:
Adamantine
Streak:
blue
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