Thesaurus Term/Concept: ONYX
| Identifier | 146359 |
|---|---|
| Class | OBJECT MATERIAL |
| Status | Preferred |
| Index? | Yes |
| Scope Note | Onyx is a cryptocrystalline form of quartz. It is a semi-precious stone that is usually cut as a cabochon, or into beads, and is also used for intaglios and cameos. |