Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.56-2.60
1
7.18
👆🏻
Fracture
-
Uneven, ConchoidalWalter Schumann
Cleavage
Perfect
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Mohs Hardness
5-6.56-6.5
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8