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t-shirts agate t-shirts mineral t-shirts minerals t-shirts close-up t-shirts close up t-shirts cross-section t-shirts cross section t-shirts sectioned t-shirts cross sections t-shirts quartz t-shirts silicon oxide t-shirts silicon dioxide t-shirts geode t-shirts geodes t-shirts polished t-shirts

photographs agate photos mineral photos minerals photos close-up photos close up photos cross-section photos cross section photos sectioned photos cross sections photos quartz photos silicon oxide photos silicon dioxide photos geode photos geodes photos polished photos

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A close-up view of agate. Agate is a form of the mineral quartz (silicon oxide). The colors are due to metal ion impurities as the mineral formed.