A vein of Blue John
Whilst on holiday in the Peak District last week, we visited some of the mines and caves of the Hope Valley. This is a cavern where the Blue John mineral is mined. One of only 2 mines in the area that still mines for Blue John.
Derbyshire Peak is the only place in the world where Blue John is found.
This photo was taken in Treak Cave.
There were some wonderful stalagtites and stalagmites, and fossils when we went on the cavern visit. We were encouraged to take photos......so I did!