| Place Name | Blue John Cavern |
| Place Type | Natural/Geological Feature |
| Township | Castleton |
| Parish | Castleton |
| Grid Ref | SK1383 |
| Hundred | Europe |
| County | Derbyshire |
| Country | United Kingdom, England |
| Notes | A natural limestone cavern near Castleton in the White Peak area of the Peak District National Park. Famous for its deposits of the rare mineral Blue John, the cavern contains impressive natural cave formations and has been worked for fluorite extraction for centuries. |
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