Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.85-3.942.20-2.23
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Irregular/uneven, Uneven
Cleavage
{010} Good, {100} Distinct
Perfect on {110} and {1 1 0}
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.