General Information:
Chemical Formula:
(Fe,Mn)(Ta,Nb)2O6
Composition:
(Molecular Weight = 513.74 gm)
Tantalum 70.44 % Ta
Iron 10.87 % Fe
Oxygen 18.69 % O
Empirical Formula:
Fe2+Ta2O6
Environment:
Pegmatites and alluvial deposits.
IMA Status:
Not IMA Approved
Locality:
Sukkula, Finland.
Name Origin:
Named after the god Tapio of Finnish mythology.
Physical Properties:
Cleavage:
[110] Imperfect
Color:
black.
Density:
8.17
Diaphaniety:
Opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
brown
More details...