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Fluorite & Stilbite

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RBR161499

Fluorite & Stilbite

Description Tabs

Description
Locality: 
Hirschau Quarry, Böckstein, St Johann im Pongau District, Salzburg, Austria
Size Range: 
Museum (18cm plus)
Size: 
25 × 13 × 4.5 cm
Description

Well developed specimen featuring several intergrown octahedrons up to 2,5 cm on edges.. This piece is quite big for the location and shows microcrystallized stilbite on some of the fluorite's faces. This is a very good contrast to the light green to green crystals. So significant damages.

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

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White