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Any of the forms of silicon dioxide (SiO), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically.
This entry comes from Encyclopædia Britannica Concise. For the full entry on silica mineral, visit Britannica.com.
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