Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.90-3.14
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, Uneven
Cleavage
{010} Good, {100} Distinct
Imperfect; basal
Mohs Hardness
5-5.57.5-8
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.