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What is the Chemical Formula for Chalcedony + Peruvian Opal, combined?

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I know Chalcedony's chemical formula is SiO2, but I don't know Peruvian Opal's, or what they make when combined. I would love it if anyone is able to tell me any and everything regarding this subject.

asked Oct 14, 2016 by Lookn4ChemFormofGems (160 points)

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