1 Physical Properties
1.1 Tenacity
1.2 Solubility
Poorly soluble in dilute HCl
insoluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.80-2.953.95-4.03
1
7.18
1.5 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, Gems, Sixth Edition (2006)
1.6 Cleavage
Perfect on {10 1 1}, rhombohedral cleavage
None, but may exhibit parting
1.7 Mohs Hardness
1.8 Chemical Composition
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 2 O 3