Fluorite

specimen number:
9892130

location:
Rogerley Mine, Stanhope, Co., Durham, England, UK

description:
Both sides of this matrix are covered with lustrous green translucent crystals of fluorite. Intensely fluorescent, the most prominent crystal groupings are twinned and measure to 2.7 x 1.8 x 1.8 cm in size. Slight chipping present as seen.

Situated in the Weardale region of County Durham, England, the Rogerley Mine is a famous underground mineral deposit located within the classic North Pennine Orefield. The local geology features Carboniferous limestone and shale strata crosscut by hydrothermal vein systems where low-temperature ore-bearing fluids deposited abundant minerals within open fissures and cavity spaces. reopened by mineral collectors in the late twentieth century, the mine became world-renowned as a dedicated specimen-mining operation rather than a commercial lead mine. It is best known for producing world-class specimens of fluorite, which frequently occur as sharp, interpenetrating twin crystals displaying a striking emerald-green color. These fluorite crystals exhibit remarkably strong daylight fluorescence, dramatically shifting to an intense blue color under ultraviolet light due to trace rare earth elements within the crystal structure.

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