1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.56-2.603.98-4.04
1
7.18
1.5 Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle
1.6 Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Imperfect, poor one {100}
1.7 Mohs Hardness
1.8 Chemical Composition
Plagioclase Feldspar s: (Na,Ca)Al1-2Si3-2O8 Orthoclase Feldspar : KAlSi3O8
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references