Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.00-2.455.00-5.30
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
none
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
2-46
2
10
👆🏻
Chemical Composition
Cu2H2Si2O5(OH)4
Fe 2O 3Arthur Thomas , Gemstones (2009)