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Fluorite & Calcite In Psm Fossil Shell

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CLB508840

Fluorite & Calcite In Psm Fossil Shell

Pseudomorph

Description Tabs

Description
Locality: 
Gyöngyösoroszi, Mátra Mountains, Heves County, Hungary
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2 × 1.6 cm
Description

Probably the most unusual specimen I got recently: greenish fluorite and yellow calcite crystal in a calcite geode with tiny pyrite crystals. This geode was obviously a fossil shell. I'm not 100% sure, but I think this was a sea-urchin shell - like the kind you find nowadays at the beach.

This asks for further investigation.

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

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