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Fluorite

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PCZ520621

Fluorite

Description Tabs

Description
Locality: 
Old Tor Mine, Castleton, Derbyshire, United Kingdom
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3 × 2 cm
Description

A very interesting and unusual old time terminated 'Blue John' fluorite specimen from the famous Old Tor Mine, Derbyshire, collected sometime in the early 1950's. This mine is one of the smaller and less often seen sources of 'Blue John'.

The specimen comprises of a mass of yellowish translucent cubes with stepped faces and sharp edges. Faces showing blue-purple and brownish inclusions in the outermost parts of the crystals along with similar coatings to the centres of the cube faces. This indicates hydrocarbon contamination of the hydrothermal crystal forming fluids during the last phases of crystallisation. 

Cleaved surfaces on the underside show the classic, much sought after blue-yellow colour variation of this world famous form of fluorite.

A good Specimen and increasingly hard to find in this condition. 

The largest crystal measures 1.5cm on edge.

Mineral Data
What's on the rock

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
Peter Crozier Minerals