Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
Indistinct parting on [111]
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)