Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.20-3.506.86-7.03
1
7.18
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Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Indiscernible
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
6-76-7
2
10
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Chemical Composition
Ruby Zoisite: (Ca,Na)(Al,Mg,Fe)3Al6(BO3)3Si6O18(OH)4
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references