1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.3 Solubility
1.4 Durability
Not Available
Not Available
1.5 Specific Gravity
1.98-2.503.95-4.03
1
7.18
1.7 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Uneven, Gems, Sixth Edition (2006)
1.8 Cleavage
Not Available
None, but may exhibit parting
1.9 Mohs Hardness
1.10 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Al 2 O 3