Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.435.5
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{110} Good, {110} Good
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-65-5.5
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references