calcedony

cal·ced·o·ny  (kl-sdn-)

n.

Variant of chalcedony.

Thesaurus

Noun

1.

calcedony - a milky or greyish translucent to transparent quartz chalcedony quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities agate - an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles bloodstone, heliotrope - green chalcedony with red spots that resemble blood carnelian, cornelian - a translucent red or orange variety of chalcedony chrysoprase - a green variety of chalcedony valued as a gemstone onyx - a chalcedony with alternating black and white bands; used in making cameos plasma - a green slightly translucent variety of chalcedony used as a gemstone sard, sardius, sardine - a deep orange-red variety of chalcedony transparent gem - a gemstone having the property of transmitting light without serious diffusion