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an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
green chalcedony with red spots that resemble blood
a translucent red or orange variety of chalcedony
a green variety of chalcedony valued as a gemstone
a chalcedony with alternating black and white bands; used in making cameos
a green slightly translucent variety of chalcedony used as a gemstone
sard, sardine, sardius
a deep orange-red variety of chalcedony
an agate resembling moss with brown, black, or green markings
an onyx characterized by parallel layers of sard and a different colored mineral