General Information:
Chemical Formula:
MnTa2O6
Composition:
(Molecular Weight = 512.83 gm)
Tantalum 70.57 % Ta
Manganese 10.71 % Mn
Oxygen 18.72 % O
Empirical Formula:
Mn2+Ta2O6
Environment:
Pegmatites and alluvial deposits.
Locality:
Custer and Pennington Cos., South Dakota, USA.
Name Origin:
Named after its chemical composition containing manganese and tantalum.
Physical Properties:
Cleavage:
[100] Imperfect
Color:
black or brown.
Density:
8.1
Diaphaniety:
Opaque
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Massive - Granular - Common texture observed in granite and other igneous rock., Disseminated - Occurs in small, disti nct particles dispersed in matrix.
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Streak:
brown
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