Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.20-2.233.85-3.94
1
7.18
👆🏻
Fracture
Irregular/uneven, Uneven
Conchoidal, Uneven
Cleavage
Perfect on {110} and {1 1 0}
{010} Good, {100} Distinct
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)