Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.983.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
{010} Good, {100} Distinct
Mohs Hardness
7.5-85-5.5
2
10
👆🏻
Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)