01 n. Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next …
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Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground.(Min.)
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Same as Mexican onyx.
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A deep jet-black color.
Phrases & compounds
Onyx marble —
a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico in various colors ranging from white to deep black.