Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.90-3.10
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Splintery, Granular
Cleavage
Perfect in three directions
None
Mohs Hardness
56-6.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references