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150 to 200 million years ago, hot water containing fluorine and other minerals was forced up from deep within the Earth. When this brine reached the calcium-rich, limestone bedrock, fluorite crystals formed along the walls of fractures and voids in the rock.  

Fluorite is Allochromatic, meaning that it can be tinted with elemental impurities. It is one of the most varied colored minerals in the mineral kingdom, and the colors may be very intense and almost electric.