Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.55-2.703.25-3.35
1
7.18
👆🏻
Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Perfect in three directions
Mohs Hardness
6.5-75
2
10
👆🏻
Chemical Composition
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references