Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.23.05-3.08
1
7.18
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Fracture
Subconchoidal, Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
Good in one direction
Poor on {100}
Mohs Hardness
6-6.55
2
10
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Chemical Composition
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)