Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.602.11-2.20
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Perfect on {0001}
Mohs Hardness
6-6.5-9999
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Mg 6Cr 2(CO 3)(OH) 16 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references