Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.32-3.43
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Poor on {110} and {100} very poor 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
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4