Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.27-2.336.86-7.03
1
7.18
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Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
5.5-66-7
2
10
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Chemical Composition
Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references