Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.76-5.035.2
1
7.18
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Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
None
Good in one direction
Mohs Hardness
5.5-6.56-6.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references