The Collaborative International Dictionary
Onyx \O"nyx\, n. [L., fr. Gr. ? a claw, finger nail, a veined gem. See Nail, and cf. Onycha.]
(Min.) 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.
Same as Mexican onyx.
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A deep jet-black color.
Onyx marble, Mexican onyx, a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico in various colors ranging from white to deep black.
Wiktionary
n. A banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico.
WordNet
n. a hard compact kind of calcite [syn: alabaster, oriental alabaster, Mexican onyx]
Wikipedia
The Onyx Marble is a geologic formation in Arizona. It preserves fossils dating back to the Neogene period.
Usage examples of "onyx marble".
One hundred meters by twenty-five, with a basic pavement of black onyx marble they had gotten cheap after the War, stripped from ruined palazzi in Sienna.