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Opals can actually be made from metals and non-metals and are of perticluar interest in modern Nanotechnology because they posess something called a photonic bad gap. This basically allows no light of a certain wavelength to propagate through the structure. Natural opals are formed from silicon dioxide otherwise known as silica. In research opals are commonly created from silica, silicon, PMMA and polystyrene.

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15y ago

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