Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.943.21-3.38
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Irregular/uneven, Uneven
Cleavage
{010} Good, {100} Distinct
Perfect on {001}
Mohs Hardness
5-5.56-7
2
10
👆🏻
Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references