Tenacity
-
Sectile
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.56-2.606.13
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Distinct on {001} and {110}, indistinct on {100}
Mohs Hardness
6-6.52-3
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references