Group of transparent crystals of Fluorite showing penetration twins. The Fluorite cubes change their color in different lights, they show a blue color in natural light and a green one in artificial light. The sample has been photographed both in artificial light (green color) and in sunlight (blue color). Also very fluorescent under UV. Very nice Rogerley Fluorite, minor damage. Watch video. Specimen size: 5 cm x 3 cm Watch the video below
Diana Maria mine, Rogerley Quarry, Frosterley, Durham, England, UK.