- Types:
- show 9 types...
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agate
an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
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bloodstone, heliotrope
green chalcedony with red spots that resemble blood
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carnelian, cornelian
a translucent red or orange variety of chalcedony
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chrysoprase
a green variety of chalcedony valued as a gemstone
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onyx
a chalcedony with alternating black and white bands; used in making cameos
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plasma
a green slightly translucent variety of chalcedony used as a gemstone
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sard, sardine, sardius
a deep orange-red variety of chalcedony
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moss agate
an agate resembling moss with brown, black, or green markings
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sardonyx
an onyx characterized by parallel layers of sard and a different colored mineral
