Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.5-9999
1
7.18
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Fracture
Conchoidal
Sub-Conchoidal, Splintery
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
{201} Imperfect, {100} Poor, {001} Poor
Mohs Hardness
5-5.53.5-4
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
FeAsO4·2H2O