Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.083.85-3.94
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
Conchoidal, Uneven
Cleavage
None
{010} Good, {100} Distinct
Mohs Hardness
6.55-5.5
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)