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Botallackite, chemical formula Cu2[(OH)3|Cl] 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.[1] In the monoclinic crystal system, Botallackite is mountain-green to green in colour, with one distinct to good cleavage.[1] Botallackite forms in copper deposits exposed to weathering and salt water.[1] References 1. ^ a b c Mindat information page for Botallackite Retrieved from "http://en.wikipedia.org/"
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