Rogerley Mine,Frosterley,Country Durham,United Kingdom
12mm x 6mm x 4mm
Well formed, cubic crystals of fluorite from world famous locality - Rogerly Mine. Medium luster. Fluorite cubes are in dark emerald green colour with a strong blue daylight fluorescence, and an even stronger purple-white fluorescence under long wave UV light. This amazing fluorite crystals change colour in different lights - in natural light they are blue, in artificial light they are green. ;
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