Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.55-2.636.86-7.03
1
7.18
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Fracture
Uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
{001} Perfect, {010} Good
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
6-6.56-7
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references