Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.9
1
7.18
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Fracture
Conchoidal
Fibrous
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
[010] Perfect, [100] Distinct, [011] Distinct
Mohs Hardness
5-5.52
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
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite