Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99995.2
1
7.18
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Fracture
-
Subconchoidal, Conchoidal
Cleavage
-
Good in one direction
Mohs Hardness
-99996-6.5
2
10
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Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references