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Hyalite

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BMM684141

Hyalite

Description Tabs

Description
Locality: 
Valeč, Doupov, Karlovy Vary Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 5.2 × 5 cm
Description

A fine specimen of this strange bubbly form of Opal from the classic location at Valeč, Doupov, Czech Republic. Glassy colourless hyalite covers the top of the leucitic tephrite matrix. With two chips; nevertheless a considerable specimen! The center of the hyalite changes the color under UV light to green.

Mineral Data
What's on the rock

Hyalite

Variety Of: 

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Formula: 
SiO2·nH2O
Hardness: 
5.5 - 6.5
Streak: 
white