Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.00-4.622.60-2.64
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, Splintery, Conchoidal
Cleavage
Indistinct parting on [111]
Absent
Mohs Hardness
7.5-86.5-7
2
10
👆🏻
Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2Arthur Thomas , Gemstones (2009)