This is a thumbnail of a Fluorite from the Rogerly Mine in Wearedale, England. Fluorite is a calcium fluoride crystal with a hardness of 4. It can be cubic or octahedral & in wide array of colors (colorless, multi, green, purple, white, yellow, red, pink & black).
Rogerly Fluorite is a unique cubic fluorite that exhibits a reactivity to daylight. UV rays cause the green crystals to turn a bright blue-purple. It was only found in the Rogerley Mine in Weardale, England. The mine is no longer producing, making it a highly sought after collector's item.
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This piece measures approximately 1.8cm x 1.3cm x 1.5cm and comes with a complimentary "perky box" and a display card listing the stone name and locale.