Agate

Agate, the gemstone, comes in many forms and colors, most of which were considered ornamental stones or hardstones in the Realms. Agates are a form of chalcedony which make them part of a large family of gems and minerals. Varieties popular in the Realms included:
 * Banded agate
 * Eye agate
 * Fire agate
 * Frost agate
 * Iris agate
 * Moss agate
 * Tiger's eye agate
 * Turritella