Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.95-4.10
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
None
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
7-7.53.5-4
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references