aha! Good ole light refraction at work. So when you see an opal that has many different colors it just means that the silica spheres within are inconsistently sized and spaced.
RE: Australian Opal
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Australian Opal
Well, specific sizes create specific colors for instance 0.1 micron makes violet, 0.2 micron makes red. And the space between them is a water/silica solution so that has some play on the way the light bends through the opal.
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