Tenacity
-
-
Solubility
-
Insoluble in acids
Durability
-
-
Specific Gravity
-99994.20-4.30
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
None
{110} good, 100 moderate, parting on {092} and {011}
Mohs Hardness
7-7.56-6.5
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)