Botallackite
Mineral Cu2Cl(OH)3
About it
Pale bluish green crusts and thin plates of copper chloride, a less stable form than atacamite. Named for the Botallack mine in Cornwall, where it formed on sea-washed copper ores.
- Type
- Mineral
- Group
- Halide, atacamite group
- Formula
- Cu2Cl(OH)3
- Hardness (Mohs)
- 3
- Specific gravity
- 3.5–3.7
- Streak
- pale green
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- pale bluish green
- Transparency
- translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.