Great specimen of well formed, lustrous, cubic and gemmy, twinned crystals of fluorite from world famous locality - Rogerley Mine combined with galena. Lustrous fluorite cubes have great color - dark emerald green with a strong blue daylight fluorescence, and an even stronger purple-white fluorescence under long wave UV light. This amazing fluorite crystals change color in different lights - in natural light they are blue, in artificial light they are green. The biggest crystal size is 1.8 x 1.7 cm.