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Hyalite

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MGR557730

Hyalite

Description Tabs

Description
Locality: 
Valeč, Doupov, Karlovy Vary Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 3.6 × 3.7 cm
Description

Typical hyalite from this classic locality. Attractive assemble with glassy and lustrous hyalite exposed at the top of the specimen. This specimen is very special because of the combination with apatite. Minor apatite is developed in tiny white crystals below the hyalite group. Under UV light hyalite shows intense purple color. Undamaged.

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