1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.56-2.603.20-3.25
1
7.18
1.5 Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
1.6 Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Good/distinct on [210]
1.7 Mohs Hardness
1.8 Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references