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BOULDER OPAL - Australia

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Home > MINERALS > PRECIOUS AND SEMI-PRECIOUS GEMSTONES

BOULDER OPAL
Vein of precious opal in sandstone


Quilpie, Queensland, Australia

Sandstone with opal veins is called ‘boulder opal’. This is a small, but good example.
 
Precious opal owes its beauty to the remarkable play of changing colours.  This is due to the reflection and scattering of light from minute, uniformly-sized spheres of silica that make up the stone.  The colours are not caused by a pigment or impurity; the closely-packed spheres form a ‘diffraction grating’ that splits white light into the colours of the spectrum. 

Click on a picture for a larger image


Size: 7 x 4 x 1 centimetres
Weight: 62 grams

PRICE: £35.00
BOULDER OPAL -  Australia
BOULDER OPAL -  Australia BOULDER OPAL -  Australia BOULDER OPAL -  Australia BOULDER OPAL -  Australia