1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Dilute acid
1.1 Durability
1.4 Specific Gravity
1.6 Fracture
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
1.7 Cleavage
Perfect {010}, imperfect {100}
Distinct on {010}, imperfect {110} and {011}
1.8 Mohs Hardness
1.14 Chemical Composition
Ca2Al3(SiO4)3(OH)
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references