Tenacity
-
Brittle
Solubility
-
Gelatinises in acids
Durability
-
-
Specific Gravity
5.52.4-2.5
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Distinct on {110}
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2