Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.62-2.652.90-2.98
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
001
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
67.5-8
2
10
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Chemical Composition
Microcline: KAlSi3O8 Oligoclase: (Na,Ca)Al1-2Si3-2O8
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references