Diana Maria Color Change Fluorite on Matrix from UK

Wonderful, etched cubic fluorite crystals on matrix. The crystals fluoresce when exposed to sunlight as well as ultraviolet light. From Diana Maria Mine, Rogerley Quarry, Frosterley, Stanhope, Co. Durham, England, UK.
Measures approximately 71 x 57 x 43mm and weighs 126 grams. Please see photos for details. The last image was taken indoors.