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OPAL (CABOCHON CUT): INTERNAL IRIDESCENCE<br />
(Variations Available)<br />
Black Opal Doublet (large) with White Opals.SiO2.nH20<br />
 Amorphous silicate with noncrystalline structure.  Electron microscopy shows structure to be regularly packed tiny spheres responsible for light interference creating the color play.

Fphoto-44159712E-3PS.jpg

OPAL (CABOCHON CUT): INTERNAL IRIDESCENCE
(Variations Available)
Black Opal Doublet (large) with White Opals.SiO2.nH20
Amorphous silicate with noncrystalline structure. Electron microscopy shows structure to be regularly packed tiny spheres responsible for light interference creating the color play.

Copyright:© 1997 Paul Silverman - Fundamental Photographs

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Paul Silverman