1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Poorly soluble in dilute HCl
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
ConchoidalMichael OâDonoghue, Gems, Sixth Edition (2006), Gems, Sixth Edition (2006)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Indiscernible
Perfect on {10 1 1}, rhombohedral cleavage
1.7 Mohs Hardness
1.13 Chemical Composition
SiO2
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references