Fluorite

specimen number:
2063734

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

description:
A semi lustrous translucent attractive deep green cubic crystal of fluorite, this with one smaller crystal attached along one edge. In good condition with just slight damage present. Brightly fluorescent under longwave ultraviolet light. Collected in the early to mid 2000's. The specimen comes with a previous label from the collection of Ray DeMark.

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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