Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.65-4.55
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Conchoidal
Cleavage
Absent
None, but may exhibit slight parting
Mohs Hardness
6.5-77.5-8
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)