Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.093.85-3.94
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
Perfect on {100} and {010}, imperfect on {101}
{010} Good, {100} Distinct
Mohs Hardness
85-5.5
2
10
👆🏻
Chemical Composition
CaAl2Si2O7(OH)2.H2O
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)