Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.2-9999
1
7.18
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Fracture
Subconchoidal, Conchoidal
-
Cleavage
Good in one direction
-
Mohs Hardness
6-6.5-9999
2
10
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Chemical Composition
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
SiO2, Al2O3, CaO, MgO, FeO