agatize
/ˈæɡəˌtaɪz/
verb
- To convert or be converted into agate, or to give something the appearance or properties of agate.
- Over millions of years, the wood began to agatize as minerals seeped into its cells.
- Fossils sometimes agatize when silica-rich water replaces organic material.
- The artist used a special technique to agatize the surface of the clay vase.
Synonyms