Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.56-2.60
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, ConchoidalWalter Schumann
Cleavage
{010} Good, {100} Distinct
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
5-5.56-6.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8