Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.34-3.44
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
7-7.58-8.5
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references