Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Sub-Conchoidal, Conchoidal
Distinct on [110], parting on {221}
Indistinct parting on [111]
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)