Tenacity
Very brittle
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
3.30-3.405.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{010} perfect, {110} distinct, {100} in traces
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6.5-75-5.5
2
10
👆🏻
Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references