Large cabinet specimen of blue-green-purple fluorite from the Rogerly Mine, Weardale, County Durham, England. Fluoresces a bright electric blue color. Also exhibits daylight fluorescence in the sunlight. Some crystals have a light silica frosting on preferential faces. No damage. Measures 6.5 x 5 x 2 inches (16.5 x 12.7 x 5 cm).