1 Physical Properties
1.1 Tenacity
1.2 Solubility
Poorly soluble in dilute HCl
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.80-2.952.32-2.38
1
7.18
1.5 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
1.6 Cleavage
Perfect on {10 1 1}, rhombohedral cleavage
Not Available
1.7 Mohs Hardness
1.8 Chemical Composition
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)