Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.58-2.74
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
ConchoidalWalter Schumann, Splintery
Cleavage
{010} Good, {100} Distinct
{100} Distinct, {110} Distinct
Mohs Hardness
5-5.55.5-6
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 4Al 3Si 9O 24Cl to Ca 4Al 6Si 6O 24(CO 3,SO 4)Walter Schumann , Gemstones of the world (2001) More from other references