1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.3 Solubility
1.6 Durability
Not Available
Not Available
1.7 Specific Gravity
3.95-4.032.60-2.70
1
7.18
1.8 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
Irregular, Irregular, Gemstones of the world (2001)
1.9 Cleavage
None, but may exhibit parting
Not Available
1.10 Mohs Hardness
1.11 Chemical Composition
Al 2 O 3
CaCO 3Ulrich Henn and Claudio C.