Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99995.50-5.90
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
7-7.54
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)