Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.603.69-3.81
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
6-6.58.5
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
BeAl 2 O 4