Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.21-3.38
1
7.18
👆🏻
Fracture
Conchoidal
Irregular/uneven, Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {001}
Mohs Hardness
5-5.56-7
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references