Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.53.69-3.81
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5-5.58.5
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
BeAl 2 O 4