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Earthwatcher's photos with the keyword: Blue John
Dirtlow Rake gems 1
| 14 Oct 2007 |
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Yellow barytes (BaSO4) and purple fluorite "Blue John" (CaF2) on grey Carboniferous limestone from Dirtlow Rake, near Castleton, Derbyshire.
Width of view: approx 7 cm.
Dirtlow Rake gems 2
| 14 Oct 2007 |
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A closer view of yellow barytes (BaSO4) and purple fluorite "Blue John" (CaF2) from Dirtlow Rake, near Castleton, Derbyshire.
Width of view: approx 4 cm.
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