Fluorite from the Rogerley Mine, Weardale, County Durham, England
Contributed by: Chris Clemens
minID: 9JR-GHH
Date: May 20th, 2026
Locality: Rogerley Mine, Rogerley Quarry, Stanhope, County Durham, England, UK (See on Mindat)
Size: 5.5 x 2.5 x 8.1 cm
Description:
Gemmy, green cubes of fluorite with minor non-fluorescent galena on a light brown matrix, from the source of some of the most beautiful and brightly fluorescent fluorite in the world- the Rogerley Mine, Frosterley, Weardale, North Pennines, County Durham, England. The fluorescent response of this fluorite is so bright, it can be seen under daylight; a phenomenon called daylight fluorescence, which results from the UV component of sunlight stimulating a visible fluorescent response seen as a blue color change in the green fluorite cubes. In this series of photographs, the fluorite cubes can be seen fluorescing blue under short and long wave UV, as well as under daylight in open shade.
Originally posted by Chris Clemens on Nature's Rainbows in 2016.
Summary of luminescence responses:
Fluorite (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm Lamp/Mercury) UV light: Blue
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
- Fluorescence under Daylight: Blue