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Fluorite

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JNM617600

Fluorite

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Description
Locality: 
Wanni Glacier, Binn Valley, Wallis, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 5 × 3.5 cm
Description

Alexandrite effect. Color-change fluorite appearing green in daylight, but partially purple under incandescent illumination. This is extremely rare material from the only known locality in the entire Alps to produce such specimen. This color change has been named "Alexandrite effect" in analogy to the chromium-rich chrysoberyl variety. Given their abundance in the Binn Valley, the effect is supposed to stem from rare earth element doping increasing the crystals effective optical transmission in the red. The fluorite on hand measures 12 mm along its longest dimension and exhibits a rounded shape based on a rhombic dodecahedron.

The close-up images are each taken under daylight or candle light (white balance adjusted) respectively.

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

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