Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.57-2.666.86-7.03
1
7.18
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Fracture
Subconchoidal, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Fair on {100}, poor on {001} and {010}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
7-7.56-7
2
10
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Chemical Composition
Mg2Al4Si5O18
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references