Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.52.56-2.60
1
7.18
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Fracture
Granular
Uneven, ConchoidalWalter Schumann
Cleavage
None
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
5-66-6.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8