Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.62-2.656.86-7.03
1
7.18
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Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
001
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
66-7
2
10
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Chemical Composition
Microcline: KAlSi3O8 Oligoclase: (Na,Ca)Al1-2Si3-2O8
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references