Cornwallite and olivenite crystals from Wolfach, Germany. Cornwallite is a relatively rare, green, copper arsenate mineral. It is named after the location of its discovery in Wheal Gorland, Cornwall, UK. Olivenite is a copper arsenate mineral. Its name derives from its olive-green colour, which varies in shade from blackish-green in the crystals to almost white.

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Photo credit: © FRANK FOX/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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