Blue John from selected localities.
UK | |
| [www.thamesvalleyminerals.com] |
Mason, A. (1976) The world of Rocks and Minerals. New York, N.Y., Larousse & Co., 108 pages.; Worley, N.E. (1978) Stratigraphical Control of Mineralisation in the Peak District of Derbyshire. Ph.D. Thesis, University of Leicester. | |
Quirk, D.G. (1986): Bulletin of the Peak District Mines Historical Society 9(6), 333-386 |
Old Tor Mine, Castleton, High Peak, Derbyshire, England, UK