Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.602.95-3.07
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Mohs Hardness
6-6.55-6
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.