Depending on the conditions in which it formed, opal may be transparent, translucent, or opaque, and the background color may be white, black, or nearly any color of the visual spectrum. Opal, silica mineral extensively used as a gemstone, a submicrocrystalline variety of cristobalite Photos of opal from around the world
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Guidance for people who want to buy opal, see different types of opal, understand their names, learn about synthetics and imitations.
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