Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.74-2.906.86-7.03
1
7.18
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Fracture
Uneven, Splintery
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect on {100} and {001}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
4.5-56-7
2
10
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Chemical Composition
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references