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Floris van Breugel
Graduate Student

A wide variety of fluorescent minerals including scheelite (blue/white), calcite (red), silica coatings containing uranyl ions (green), fluorite (pink), and 'desert varnish' (yellow/orange), populate some of the mine tailings of a Tungsten ore mine near Darwin, California. I used a short wave ultraviolet light to illuminate the scene during a single 20 minute long exposure. Fluorescence is commonly used in biology to label cellular components, but rarely do we hear about it in the context of naturally occurring

floris@caltech.edu

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