Yttropyrochlore-(Y)

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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