Fluorite

Unknown Owner

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A superb specimen from Cal Graeber's summer mining project. They were about to give it the last season here, when they hit what is now called "The Jewel Box Pocket," with some of the finest green penetration twins ever found in England. These are huge crystals for the locality, to 3 cm on edge, and gemmy. The color saturation is intense. These fluoresce a deep vivid purple even in sunlight...you don't even need a UV light to get the effect. A window, a door even, lets in enough natural UV to make them bicolor green and purple as you twist the specimen in the light rays.