Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Perfect [001] good [010] poor [110]
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)