Information
Specific Gravity: 3.70 - 3.90
Hardness: 3.5 - 4.0
Refractive Index: 1.730 - 1.838
Birefringence: 0.108 - 0.110
Crystal System: Monoclinic
Luster: Vitreous
Chemical Composition: Cu₃(CO₃)₂(OH)₂
Optical Character: Biaxial (+)
Pleochroism: Not Visible In Aggregates, Moderate To Strong In Different Tones Of Blue In Single-Crystal Material
Transparency: Transparent To Translucent
Color: Blue, Very Dark Blue To Pale Blue, Pale Blue In Transmitted Light.
Remark: -