1 Physical Properties
2.2 Tenacity
2.4 Solubility
2.6 Durability
Not Available
Not Available
2.7 Specific Gravity
2.10 Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Not Available
2.11 Cleavage
Perfect in three directions
None
2.12 Mohs Hardness
2.16 Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAlB 3O 7Michael OâDonoghue , Gems, Sixth Edition (2006)