Fluorescent Chalcedony

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Chalcedony is a type of quartz. Basically silicon and some oxygen. One of the most abundant minerals on the face of the earth.

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Most quartz is not fluorescent, but sometimes it contains trace amounts of uranium and fluoresces green when illuminated with short wave ultraviolet light.

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These are all little stones that I have picked up within a mile of my house, walking around in the desert with my best friend. This shows the tremendous variety there is in nature.

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