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Chalcedony Psm Fluorite

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PDM800210

Chalcedony Psm Fluorite

Classic Locality

Description Tabs

Description
Locality: 
Trestia, Maramureș County, Romania
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
11.4 × 6.9 × 5.4 cm
Description

Big block of banded chalcedony of blue to lavender colour where the top and base surfaces preserve richly pseudomorphs after fluorite. The block is covered at all faces by a thin coating of translucent chalcedony and minor brown oxides, similar to what we find in projectile points made of silex or chert, such as spear and arrow points, carved by the prehistoric men long ago. So it is quite sure that this block was detached off the formation and have been isolated for thousands of years, so the recrystallization of the chalcedony could be formed at the surface.

Ex Gerard Vogel Collection.

Mineral Data
What's on the rock

Chalcedony

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Kadıköy (Chalcedon), Istanbul Province, Marmara Region, Turkey

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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