Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.20-3.503.25-3.35
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
Indiscernible
Perfect in three directions
Mohs Hardness
6-75
2
10
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Chemical Composition
Ruby Zoisite: (Ca,Na)(Al,Mg,Fe)3Al6(BO3)3Si6O18(OH)4
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references