Description: Fluorite Rogerley Mine, Frosterley, Weardale, County Durham, England 75 x 70 x 39 mm Photographed using daylight balanced photofloods pulled back to just dimly light the specimen. A source of UV was held above and closer to the specimen to show strong fluorescence, as is seen outdoors in the sun on these specimens. This is about a 10 second exposure. Only brightness and contrast were adjusted, and a sharpening filter applied.

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