Tenacity
-
-
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
3.62-3.872.56-2.60
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann
Cleavage
None
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
7-7.56-6.5
2
10
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Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8