Hi Blue John can be found in many places including Castleton, Whitby and Sheffield and Cromer. You only have to find the right shop that sells stones and semi precious stones. It comes in many colours such as brown, green, purple and blu. You can just buy it in little chunks for a couple of pounds or you can buy vases are statues made of blue john. It used too be mined in Derbyshire. I have been down the mine but it was not flooded and I did not have to get into a boat. Kevin