General Information:
Chemical Formula:
Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2·(H2O)
Composition:
(Molecular Weight = 934.87 gm)
Manganese 1.47 % Mn
Aluminum 2.89 % Al
Iron 4.48 % Fe
Silicon 9.01 % Si
Tellurium 13.65 % Te
Hydrogen 0.22 % H
Lead 44.33 % Pb
Oxygen 23.96 % O
Empirical Formula:
Pb2Fe3+0.75Mn3+0.25TeAlSi3O12(OH)2
Environment:
Secondary mineral intergrown with dickite.
IMA Status:
Approved IMA 1979
Locality:
Moctezuma mine, Moctezuma, Sonora, Mexico.
Name Origin:
Named for Carlos Burckhardt (1869-19350, Swiss geologist working in Mexico.
Physical Properties:
Cleavage:
[001] Perfect
Color:
violet red, carmine red, or pink.
Density:
4.96
Habits:
Pseudo Hexagonal - Crystals show a hexagonal outline., ,
Hardness:
2 - Gypsum
Luster:
Adamantine - Pearly
Streak:
light red
More details...