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Opal

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PCZ567168

Opal

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Description
Locality: 
Silesia, Lower Silesia, Poland
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3 × 2 cm
Description

Uncommon reflective black opal from a little known locality.

Mineral Data
What's on the rock

Opal

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