Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99994.95-5.0
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
None
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
7-7.54-5
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references