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A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]

An opaque or milk-white chalcedony, a variety of quartz; also, a similar variety of opal.

A foul vein, like chalcedony, in some precious stones.

A variety of chalcedony, of a clear, deep red, flesh red, or reddish white color. It is moderately hard, capable of a good polish, and often used for seals.

A variety of quartz or chalcedony, exhibiting opalescent reflections from within, like the eye of a cat. The mane is given to other gems affording like effects, esp. the chrysoberyl.

Of or pertaining to chalcedony.

An apple-green variety of chalcedony, colored by nickel. It has a dull flinty luster, and is sometimes used in jewelry.

A variety of chalcedony containing water.

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. Onyx marble, a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico.

ing gunpowder, in large cubical grains. -- Scotch pebble, varieties of quartz, as agate, chalcedony, etc., obtained from cavities in amygdaloid.

rtz, of a color between grass green and leek green, which is found associated with common chalcedony. It was much esteemed by the ancients for making engraved ornaments.

variety of carnelian, of a rich reddish yellow or brownish red color. See the Note under Chalcedony.

A variety of onyx consisting of sard and white chalcedony in alternate layers.