Botallackite
A variety of Minerals
What is Botallackite?
Botallackite, chemical formula Cu2(OH)3Cl is a secondary copper mineral, named for its type locality at the Botallack Mine, St Just in Penwith, Cornwall. It is polymorphous with atacamite, paratacamite and clinoatacamite [Wikidata]. Botallackite crystallises in the monoclinic crystal system. It is mountain-green to green in colour, with one distinct to good cleavage.
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Key Characteristics
Formation of Botallackite
It was first described in 1865 for an occurrence in the Botallack mine, Cornwall, England, and named for the type locality. Botallackite forms in copper deposits exposed to weathering and salt water. It is reported from black smoker deposits due to reaction of primary sulfide minerals with seawater. It also occurs on copper bearing slag exposed to seawater. Minerals associated with botallackite include atacamite, paratacamite, brochantite, connellite and gypsum.
Quick Facts
Physical Properties
- Color
- Mountain-green, bluish green to green; pale bluish green in transmitted light
- Density
- 3.6 g/cm³
Chemical Properties
- Chemical Formula
- Cu2(OH)3Cl
- Elements
- Cl, Cu, H, O
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