General Information:
Chemical Formula:
Pb2Cu2Si5O14·14(H2O)
Composition:
(Molecular Weight = 1,158.13 gm)
Copper 10.97 % Cu
Silicon 12.13 % Si
Hydrogen 2.44 % H
Lead 35.78 % Pb
Oxygen 38.68 % O
Empirical Formula:
Pb2Cu2Si5O14·14(H2O)
Environment:
Pb-Cu-Ag prospect.
IMA Status:
Approved IMA 1981
Locality:
Artillery Peak, Mohave County, Arizona, USA.
Name Origin:
Named for Raymond W. Ludden, chief geologist, Phelps-Dodge Corporation.
Physical Properties:
Cleavage:
[???] Distinct
Color:
nickel green.
Density:
4.45
Diaphaniety:
Translucent
Habits:
Rosette - Bundled tabular aggregates resembling rose flower petals., Fan Shaped - Occurs as radiating crystals shaped like a fan., Aggregates - Made of numerous individual crystals or clusters.
Hardness:
4 - Fluorite
Streak:
light green
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