Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.44-2.622.90-2.98
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Indiscernible
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
2.5-5.57.5-8
2
10
👆🏻
Chemical Composition
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references