1 Physical Properties
1.1 Tenacity
1.2 Solubility
Slowly dissolves in water
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
Not Available3.26-3.36
1
7.18
1.4 Fracture
Conchoidal, Brittle
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
1.5 Cleavage
1.6 Mohs Hardness
1.12 Chemical Composition
Not Available
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references