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Hyalite & Apatite

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MGR550904

Hyalite & Apatite

Description Tabs

Description
Locality: 
Valeč, Doupov, Karlovy Vary Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
6.2 × 7.7 × 3.6 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. Apatite is developed in tiny white crystals sursounding 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

Apatite

Synonym Of: 

Chlorapatite

Formula: 
Ca5(PO4)3Cl
Strunz: 
8.BN.05
Hardness: 
5.0

Fluorapatite

Formula: 
Ca2Ca3(PO4)3F
Strunz: 
8.BN.05
Hardness: 
5.0

Hydroxylapatite

Formula: 
Ca5(PO4)3(OH)
Strunz: 
8.BN.05
Hardness: 
5.0
Crystal System: 
Hexagonal
Hardness: 
5