chalcedony /kal-sedˈə-ni or kalˈsi-dō-ni/

A microcrystalline, white or bluish-white mineral composed of silica, usu of banded and translucent appearance and having a waxy lustre, a variety of quartz found in sedimentary rocks

chalcedonic /-si-donˈik/ adjective

chalcedˈonyx (or /-onˈ/) noun

An agate of alternating white opaque and greyish translucent chalcedony

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