EXCEPTIONAL ROGERLEY MINE FLUORITE
An Exceptional Rogerley Mine Fluorite Specimen. This specimen is museum quality Fluorite and a one-of-a-kind piece. It was found on 30 May 2013 directly behind “The Weardale Giant” the famous large plate found in the Penny’s Zone part of the mine. This beautiful green Fluorite comes from one mine in the world. Fluorite from this mine is world famous for its “daylight fluorescence”, or rare ability to fluoresce in daylight. It is also fluorescent under long and short wave UV light. An essential mineral for the serious collector and a personal favourite!.
The daylight fluorescence is particularly marked in overcast weather, but still noticeable in any conditions. Photos are taken both indoors and outside. We have added a pic of this specimen under long wave ultra violet light, which shows as bright blue. The daylight fluorescence is suspected to be caused by the inclusion of Rare Earth Elements (REE), minerals including phosphates (monazite and xenotime) and fluorocarbonates (mainly synchysite).
Location: Giant Pocket, Penny’s Pocket Zone, Rogerley Mine, County Durham, England.
Dimensions: 18.5cm x 17cm x 8cm, 3,270g.
CaF2 Calcium Fluoride.
Named in 1797 by Carlo Antonio Galeani Napione from the Latin, fluere “to flow” (for its use as a flux). The term fluorescence is derived from fluorite, which will often markedly exhibit this effect. The element fluorine also derives its name from fluorite, a major source for the element.
Fluorite is found as a common gangue mineral in hydrothermal veins, especially those containing lead and zinc minerals. It is also found in some greisens, granites, pegmatites and high-temperature veins. Also as a component of some marbles and other metamorphic rocks.