Boltsburn Mine, Rookhope, Stanhope/Weardale, County Durham, England

13 x 11 x 4.9 cm

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A single cubic Fluorite crystal on a bed of reddish brown colored, bladed Siderite crystal with a botryoidal habit. The Fluorite is a very light green color within the interior and a hint of purple along the edges. Under LW UV, the Fluorite is very fluorescent. The mine was closed in 1931. It was famous for very transparent Fluorite which was sold for the manufacture of microscopes. Although not visible in the photos, one corner of the Fluorite crystal which is transparent. And although quite a number of Fluorite specimens were saved from the mine, Siderite specimens were less common with being one of the best.

Condition: Very Good to Excellent

Flaws: There are some internal cleaves in the Fluorite.

This mineral is also found in the following galleries: Minerals From Europe | Fluorite | Carbonates | Fluorescents | Minerals Priced Between 200 and 299 Dollars