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OPAL-INTERNAL IRIDESCENCE<br />
Amorphous SiO2.nH20<br />
Silicate with noncrystalline structure<br />
Electron microscopy shows structure to be regularly packed tiny spheres responsible for light interference creating the color play. Synthetic opal does not iridesce under this light.

Fphoto-19168807A-3PS.jpg

OPAL-INTERNAL IRIDESCENCE
Amorphous SiO2.nH20
Silicate with noncrystalline structure
Electron microscopy shows structure to be regularly packed tiny spheres responsible for light interference creating the color play. Synthetic opal does not iridesce under this light.

Copyright:© 1988 Paul Silverman - Fundamental Photographs

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Paul Silverman