Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Indistinct parting on [111]
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
insoluble in common solvents
Conchoidal, ConchoidalWalter Schumann