Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.22.55-2.63
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
Good in one direction
{001} Perfect, {010} Good
Mohs Hardness
6-6.56-6.5
2
10
👆🏻
Chemical Composition
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
KAlSi 3O 8Arthur Thomas , Gemstones (2009)