1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Poorly soluble in dilute HCl
1.3 Durability
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Perfect {010}, imperfect {100}
Perfect on {10 1 1}, rhombohedral cleavage
1.7 Mohs Hardness
1.8 Chemical Composition
Ca2Al3(SiO4)3(OH)
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references