chalcedony | | |
n. (substance) | 1. calcedony, chalcedony | a milky or greyish translucent to transparent quartz. |
| ~ 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. |
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