Devilline
Mineral CaCu4(SO4)2(OH)6·3H2O
About it
Thin blue-green scales and rosettes with a pearly sheen on their flat faces, in oxidized copper ore. Named for French chemist Henri Sainte-Claire Deville; found in many old European copper mines.
- Type
- Mineral
- Group
- Sulfate, basic calcium-copper sulfate
- Formula
- CaCu4(SO4)2(OH)6·3H2O
- Hardness (Mohs)
- 2.5
- Specific gravity
- 3.1–3.15
- Streak
- pale green
- Lustre
- vitreous (glassy), pearly
- Crystal system
- Monoclinic
- Colours
- emerald green, bluish green, pale blue
- Transparency
- translucent
- Cleavage and fracture
- perfect basal
Typical values: real specimens vary. For more, see mindat.org.