General Information:
Chemical Formula:
(Fe++,Mn++)(Ta,Nb)2O6
Environment:
Pegmatites and alluvial deposits.
IMA Status:
Approved IMA
Locality:
Sri Lanka.
Name Origin:
Named after the god Tapio of Finnish mythology and the Latin ferrium - "iron."
Physical Properties:
Cleavage:
[110] Imperfect
Color:
brownish black or black.
Density:
7.82
Diaphaniety:
Opaque
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Disseminated - Occurs in small, distinct particles dispersed in matrix.,
Hardness:
6 - Orthoclase
Luminescence:
None.
Luster:
Metallic
Streak:
brown
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