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
2.55-2.573.26-3.36
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 on {100}
1.7 Mohs Hardness
1.8 Chemical Composition
KAlSi3O8
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references