Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3-3.156.86-7.03
1
7.18
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Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Good on [110] and on [001]
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
6.0-6.56-7
2
10
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Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references