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Opal

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MN19668

Opal

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Description
Locality: 
Windorah, Barcoo Shire, Queensland, Australia
Size Range: 
Cabinet (10-18 cm)
Size: 
5.6 × 10.8 × 5 cm
Description

This sample of boulder opal from Windorah, Queensland, Australia shows opal colour over the surfaces of a red-brown ferruginous matrix.

The opal displays a variety of blue shades with minor green. There are also flashes of blue fire coming from within the depths of the opal.

This particular item is of particular interest as it shows the flow structures currently feeding the controversy as to whether there is a hydrothermal element in the formation of this material.

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Mineral Data
What's on the rock

Opal

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

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