Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.95.5
1
7.18
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Fracture
Fibrous
Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
25-5.5
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references