Blue John
Polished slice of Blue John from Derbyshire, England. The mineral is so far unique to one location in the Derbyshire Peak District, England. It is a banded white and purple variety of fluorite (calcium fluoride)
Picture No
10710161
Media ID
47580513
Size
1679px x 1591px
(1.4MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
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Derbyshire Fluorite Fluorspar Halide Mineral Polished
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