NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Azurite crystals. Azurite is a hydrated copper carbonate mineral. Its name refers to its colour, azure. In medieval times, the mineral was ground up and used by painters as a blue pigment. Azurite's colour also makes it popular with mineral collectors. Specimen from Chessy, Rhone, France.
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