Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John …

2024年7月1日 · Blue John is a rare and highly valued mineral found only in the Blue John Cavern and Treak Cliff Cavern in Castleton, Derbyshire, England. It is a form of fluorspar, a halide …

An underground wonderland of stalactites and stalagmites, rocks, minerals and fossils and home of the unique Blue John stone. Tours and activities daily. 01433 620571 …

Blue John Stone is now only mined in two caverns: Treak Cliff Cavern and Blue John Cavern. This mineral, a colour banded form of fluorspar, is so beautiful that it has been prized for many …

Blue John Stone is a rare, semiprecious mineral found at only one location in the world – in the caves of Treak Cliff Hill, Castleton, Derbyshire. This truly unique experience enables you to …

2016年9月8日 · Located in limestone, deep witihin the Treak Cliff and Blue John Caverns, Blue John has been mined for its beautiful colours for centuries. (D Veatch specimen, photo by S …

Visit gemdat.org for gemological information about Blue John. No information on health risks for this material has been entered into the database. You should always treat mineral specimens …

Blue-John is a rare and precious mineral found only in Derbyshire. Richard has acquired immense expertise in carving this exquisite and unique material, creating stunning sculptures that …

Blue John – England’s rarest and most beautiful stone At the western end of the Hope Valley, between Winnats Pass and Mam Tor is a steeply sloping hill. This is Treak Cliff, the only place …

2007年7月28日 · Blue John Stone is a rare, semiprecious mineral found at only one location in the world - a hillside near Mam Tor, just outside Castleton, in the Derbyshire Peak District National …