Chalcanthite
| Synonyms: | Blue Stone, Blue Vitriol, Copper Vitriol, Cyanosite, Cyprian Vitriol, Sulphate of Copper |
| Classification: | Sulfates |
| Chemical formula: | Cu[SO4] · 5 H2O |
| Crystal system: | Triclinic |
| Density (g/cm3): | 2.286 measured on artificial material 2.282 calculated |
| Tenacity: | Brittle |
| Cleavage: | Imperfect / fair |
| Fracture: | Conchoidal |
| Hardness (Mohs): | 2,5 |
| Colour: | Green, green blue, light blue, or dark blue |
| Lustre: | Vitreous, Resinous |
| Streak: | White |
| Transparency: | Transparent, Translucent |
| Type locality: | Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile |
| Application: | rarely mined as copper ore |