Minerals / Fluorite. Mina Moscona Solis, Spain.

Fluorite, CaF2 is calcium fluoride and is a halide mineral.  In it's pure state it is colourless, and transparent, however it is easily coloured by trace minerals, so clear colourless fluorite is not very common. This specimen is a mass of hundreds of intergrown cubic crystals, and although transparent, it has a slight yellowish colour. The specimen is from Mina Moscona Solis in Spain. 

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