Chalcosine ( Greek: χαλκός - copper), copper luster , chalcocyte - a mineral from the sulfide class, copper (I) sulfide . Chemical composition - Cu 2 S.
| Chalcosine | |
|---|---|
 | |
| Formula | Cu 2 S |
| Physical properties | |
| Color | Bluish black, gray, black, gray black, steel gray |
| Trait color | Dark grey |
| Shine | Metal |
| Transparency | Opaque |
| Hardness | 2,5 - 3 |
| Cleavage | Imperfect |
| Kink | Rugged, uneven |
| Density | 5.5 - 5.8 g / cm³ |
| Syngonia | monoclinic |
The copper (Cu) content is 79.8%, and the sulfur (S) content is 20.2%. It is usual in the form of granular and dense secretions. The color is lead gray to black. The line is dark gray to black. Cleavage perfect according to {110}. Gloss metallic. Hardness - 2 -3; density - 5.5-5.8 g / cm³. Weakly malleable. Used for smelting copper . Formed in hydrothermal zones of secondary sulfide enrichment. Associates with covelin .
Photos
Chalcosine, Hartford Co., USA