Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.602.98-3.10
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
6-6.56
2
10
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Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references