Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.5-9999
1
7.18
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Fracture
Conchoidal
Uneven, Splintery
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
[001] good, [100] distinct
Mohs Hardness
5-5.56-6.5
2
10
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Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca2Al3(SiO4)(Si2O7)O(OH)