Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.08-3.12
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
ConchoidalWalter Schumann
Cleavage
Absent
{010} Perfect
Mohs Hardness
6.5-77.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references