General Information:
Chemical Formula:
(Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7
IMA Status:
Approved IMA 1987
Physical Properties:
Cleavage:
None
Color:
dark brown or black.
Density:
4.91
Diaphaniety:
Translucent to Opaque
Hardness:
4.5-5.5
Luster:
Resinous
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