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Fluorite
Small image of Fluorite
Fluorite or fluorspar is a widely occuring mineral often found in veins between other rocks, along side quartz, calcite and barytes. It often has well formed cubic crystals and varies in colour from purple or violet to green, yellow, white or even black. It is slightly harder than calcite with which it is often confused.
Blue John is a well known blue form of the mineral which is valued for jewellery and as an ornamental stone.
This specimen shows purple fluorite cubes on top of massive white fluorite crystals. It was found in the Pennine ore field.