| NOUN | substance | calcedony, chalcedony | a milky or greyish translucent to transparent quartz |
|---|
| Meaning | A milky or greyish translucent to transparent quartz. | |
|---|---|---|
| Synonym | chalcedony | |
| Narrower | agate | An impure form of quartz consisting of banded chalcedony |
| 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 | |
| plasma | A green slightly translucent variety of chalcedony used as a gemstone | |
| sard, sardine, sardius | A deep orange-red variety of chalcedony | |
| Broader | quartz | A hard glossy mineral consisting of silicon dioxide in crystal form |
| transparent gem | A gemstone having the property of transmitting light without serious diffusion | |
| Spanish | calcedonia | |
| Catalan | calcedònia | |
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