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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Botallackite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Botallackite Localities Map
See where Botallackite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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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Botallackite FAQs
How do I identify Botallackite?
Botallackite can be identified by its Mountain-green color. Look for these key characteristics when examining specimens.
What color is Botallackite?
Botallackite typically appears in Mountain-green, bluish green to green; pale bluish green in transmitted light. Color can vary depending on impurities and formation conditions.
What is the formation of botallackite 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.
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