sardoniks

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sardonyx
{n} a precious stone, a colour
an onyx characterized by parallel layers of sard and a different colored mineral
A variety of onyx consisting of sard and white chalcedony in alternate layers
{i} type of onyx having alternating orange-brown sard and white chalcedony arranged in straight aligned bands (was used very much in the past in making cameos)
A gemstone having bands of red sard; a variety of onyx or chalcedony