General Information:
Chemical Formula:
(Bi,Ca)(Ta,Nb)2O6(OH)
IMA Status:
Approved IMA 1977
Physical Properties:
Cleavage:
None
Color:
brown, grayish black, yellow, dark gray, or pink.
Density:
6.83
Diaphaniety:
Translucent to Opaque
Hardness:
5 - Apatite
Luster:
Resinous
Streak:
gray white
More details...