Tenacity
Brittle
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
6.86-7.032.74-2.90
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal, Irregular
Uneven, Splintery
Cleavage
{100} imperfect, {110} indistinct; partings on {111} or {011}
Perfect on {100} and {001}
Mohs Hardness
6-74.5-5
2
10
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Chemical Composition
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.