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Fluorite & Calcite

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BMM623948

Fluorite & Calcite

Description Tabs

Description
Locality: 
Weißeck Area, Murwinkel, Lungau, Salzburg, Austria
Class: 
Mixed Specimens
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 7 × 3.5 cm
Description

The fluorites from the Summit Cleft of Weisseck are internationally well-known. As a new find, there is the Ice cleft with its extraordinary quality. A third cleft, less known than the two other clefts but definitely noteworthy, is located on the Eastern slope of the Weisseck Mountain. It is a very dangerous place for collecting; the lime is broken in all directions by the frost. Large pieces of rock are stapled loosely. The Rockhound has to crawl under the rocks and be very cautious when choosing which of them to remove, in order to prevent the house of cards from collapsing. If you are lucky, the reward is an excellent fluorite, characterized by its fantastic color and its translucency.

Blue semi-gloss fluorite overgrown with semi-gloss calcites. The fluorites show good transparency and light zoning on the edges. The color of the fluorite changes with different sources of light (Alexandrit Effect). This change in colors is relatively common with fluorite from Weisseck and can be seen as signature feature. The specimen is undamaged, except for the natural breakages on the edge of the specimen. Edge length of up to 2 cm. The photos were done at daylight.

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

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White