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Category:Derbyshire Blue John

English: Derbyshire Blue John, a mineral mined only in Derbyshire, England.
Derbyshire Blue John 
semi-precious mineral
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Subclass offluorite,
gemstone
Location Derbyshire, East Midlands, England, UK
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Derbyshire Blue John (en) semi-precious mineral (en) Blue John, Derbyshire Spar (en)

Subcategories

This category has the following 6 subcategories, out of 6 total.