1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven
1.6 Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
{110} Good
1.7 Mohs Hardness
1.8 Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
(Fe2+ ,Mg)Al 2(PO 4) 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)