Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.00-2.455.00-5.20
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
none
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
2-46-6.5
2
10
👆🏻
Chemical Composition
Cu2H2Si2O5(OH)4
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references