Tenacity
-
Very brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
5.53.30-3.40
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
5-5.56.5-7
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references