Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.602.33-2.37
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
ConchoidalWalter Schumann
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Perfect on {010}, good on {100}
Mohs Hardness
6-6.57.5
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Be 2BO 3(OH)Ulrich Henn and Claudio C.