Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.55-2.65
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Subconchoidal, Conchoidal
Cleavage
{010} Good, {100} Distinct
[1010] Poor
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.