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chalcedonyx

noun
chal·​ce·​don·​yx | \ ˌkalsəˈdäniks, kalˈsedᵊniks\
plural -es

Definition of chalcedonyx

: a mineral that consists of onyx in which the bands are white to gray and that is valued as a semiprecious stone

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History and Etymology for chalcedonyx

chalcedony + onyx

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