bn:02762801n
Noun Named Entity
Categories: Cubic minerals, Minerals in space group 225, Geology of Derbyshire, Fluorine compounds, Halide minerals
EN
Blue John  Derbyshire Blue John  Blue John stone  Derbyshire Blue  Derbyshire Spar
EN
Blue John is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. Wikipedia
English:
mineral
Definitions
Relations
Sources
EN
Blue John is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. Wikipedia
A form of fluorite mined in Derbyshire, England Wikipedia Disambiguation
Fluorite Wikidata
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