1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.55-2.572.54-2.78
1
7.18
1.5 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
Good in three directions
1.7 Mohs Hardness
1.8 Chemical Composition
KAlSi3O8
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references