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a. A chalcedonic variety of quartz with color, chiefly white, yellow, red,
or black, in straight parallel bands; used esp. in making cameos.
See also: banded
agate; agate;
chalcedony;
sardonyx;
jasponyx.
CF: onyx agate
b. A name applied incorrectly to dyed, unbanded, solid-color chalcedony;
esp. black onyx.
c. Adj. Parallel banded; e.g., onyx marble and onyx obsidian.
d. Jet black translucent layers of calcite from cave deposits, often
called Mexican onyx or onyx marble. See also:
travertine
Source:
Dictionary of Mining, Mineral, and Related Terms
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