Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
3.69-3.81
Fracture
Not Available
Not Available
Cleavage
Not Available
Not Available
Mohs Hardness
6.5-7
8.5
Chemical Composition
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
BeAl 2O 4Arthur Thomas , Gemstones (2009)
