Category:Derbyshire Blue John

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English: Derbyshire Blue John, a mineral mined only in Derbyshire, England.
Derbyshire Blue John 
semi-precious mineral
Wikipedia
Instance of gemstone
Subclass of fluorite
Location Derbyshire, United Kingdom
Authority control
Wikidata
Blue pencil.svg

Subcategories

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

B

D

M

T