Clinoatacamite
Mineral Cu2Cl(OH)3
About it
Green copper chloride, the monoclinic partner of atacamite, as crusts and rhombohedron-like crystals in dry copper deposits and on weathered bronze. Much old 'paratacamite' is clinoatacamite.
- Type
- Mineral
- Group
- Halide, atacamite group
- Formula
- Cu2Cl(OH)3
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 3.7–3.8
- Streak
- apple green
- Lustre
- vitreous (glassy), adamantine (diamond-like)
- Crystal system
- Monoclinic
- Colours
- pale green, emerald green, blackish green
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.