Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.00-4.652.90-2.98
1
7.18
👆🏻
Fracture
Uneven, Sub-Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on [1011]
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
5-5.57.5-8
2
10
👆🏻
Chemical Composition
ZnCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references