Tenacity
-
-
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
3.62-3.873.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
None
{010} Good, {100} Distinct
Mohs Hardness
7-7.55-5.5
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)