Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.21-3.385.5
1
7.18
👆🏻
Fracture
Irregular/uneven, Uneven
Conchoidal
Cleavage
Perfect on {001}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6-75-5.5
2
10
👆🏻
Chemical Composition
Ca 2Al 3(SiO 4) 3(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