What makes it green?
RE: Australian Opal
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Australian Opal
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The size of the silica spheres and the space between them determines the color of light.
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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.
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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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