1 Physical Properties
1.1 Tenacity
1.3 Solubility
Not Available
Not Available
1.5 Durability
Not Available
Not Available
1.7 Specific Gravity
3.20-3.322.56-2.60
1
7.18
1.10 Fracture
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
1.12 Cleavage
Poor
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
1.13 Mohs Hardness
1.15 Chemical Composition
(Mg,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8