General Information:
Chemical Formula:
(Pb,Y,U,Ca)2-xNb2O6(OH)
IMA Status:
Approved IMA 1967
Physical Properties:
Cleavage:
None
Color:
brown, greenish yellow, dark brown, or red.
Density:
5.04
Diaphaniety:
Translucent to Opaque
Hardness:
4.5-5.5
Luster:
Vitreous - Resinous
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