Tenacity
-
-
Solubility
-
-
Durability
-
Hard
Specific Gravity
3.85-3.942.67-2.78
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, ConchoidalWalter Schumann
Cleavage
{010} Good, {100} Distinct
Imperfect on the [0001]
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)
Be3Al2SiO6