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onyx

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onyx

Semi-precious variety of chalcedonic silica (SiO2) in which the crystals are too fine to be detected under a microscope, a state known as cryptocrystalline. It has straight parallel bands of different colours: milk-white, black, and red.

Sardonyx, an onyx variety, has layers of brown or red carnelian alternating with lighter layers of onyx. It can be carved into cameos.
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Dirkovitch's dull green uniform was the only dark spot at the board, but his big onyx eyes made up for it.
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