Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.25-4.10
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on { 2 01} fair on {010}
Mohs Hardness
5-5.53.5-4
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Cu2CO3(OH)2