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Blue John ....The Rainbow Mineral .

Blue John is quite a rare varity of Fluorite , which can be found in a multitude of colours , hence the name The Rainbow Mineral. 

Blue John is a purple blue variety of Fluorite , mined exclusively in the Castleton area of Derbyshire . It was formed largely during the Carboniferous geological period , 350 million years ago , from highly saline solutions , seeping into rocks deep below the surface and crystallizing there . 

The Derbyshire region relied on the mining of Blue John , since its discovery in 1766, as it became very popular during the Victorian period  due to its beautiful colourations and patterns. 

It is a birthstone for Pisces and Capricorn . It may calm anxiety , bring clarity , strengthen compassion and respect.