Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.20-3.505.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
Indiscernible
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6-75-5.5
2
10
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Chemical Composition
Ruby Zoisite: (Ca,Na)(Al,Mg,Fe)3Al6(BO3)3Si6O18(OH)4
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references