Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.55-3.73
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
none
Mohs Hardness
5-5.57-7.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)