1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Nearly insoluble in HCl and HNO3
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Brittle
1.6 Cleavage
Good on {100}
Distinct on {010}
1.7 Mohs Hardness
1.11 Chemical Composition
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Not Available