Two different lights combind into one image. The left part is UV light, while the right part is white light. A specimen of Diopside (blue-green in UV), Humite (yellow in UV) and Calcite (red in UV) collected from the Long Lake Zinc Mine in Frontenac County, Ontario, Canada. Photographed under short-wave ultraviolet light. Part of a series of the specimen in different lights.
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