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Blue John

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About Blue JohnHide

A variety of Fluorite

A banded white/purple variety of fluorite applied by locals in England.
Originally described from Castleton, Derbyshire, England, UK.

Visit gemdat.org for gemological information about Blue John.


Chemical Properties of Blue JohnHide

Formula:
CaF2

First Recorded Occurrence of Blue JohnHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Galena1 photo of Blue John associated with Galena on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Blue JohnHide

Reference List:
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Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 29.

Internet Links for Blue JohnHide

Localities for Blue JohnHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
UK (FRL)
 
  • England
    • Derbyshire
      • Castleton
Dewey, H., and Smith, B. (1922) Special Rep. Mineral Resources G.B. 23.
[www.thamesvalleyminerals.com]
Worley, N.E. (1978): Stratigraphical Control of Mineralisation in the Peak District of Derbyshire. PhD Thesis, University of Leicester
Quirk, D.G. (1986): Bulletin of the Peak District Mines Historical Society 9(6), 333-386
Mineral and/or Locality  
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