General Information:
Chemical Formula:
(Ta,Nb,Sn,Fe++)O2
IMA Status:
Approved IMA 1962
Physical Properties:
Cleavage:
[???] Indistinct
Color:
gray, black, or steel gray.
Density:
7.03 - 7.23, Average = 7.13
Diaphaniety:
Opaque
Hardness:
6-6.5 - Orthoclase-Pyrite
Luster:
Metallic
Streak:
gray
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