General Information:
Chemical Formula:
(Sb+++,Ca)2(Ti,Nb,Ta)2(O,OH)7
IMA Status:
Approved IMA 1979
Physical Properties:
Cleavage:
None
Color:
dark brown or black brown.
Density:
5.3
Diaphaniety:
Translucent to Opaque
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
brownish white
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