A glassy, very hard mineral, silicon dioxide, SiO2, found in a variety of forms, including quartz, opal, chalcedony, sand, or chert
A gem, such as an opal, that has commercial value but is not as rare or expensive as a precious stone.
Anything prized for its beauty and value, esp. if small and perfect of its kind
A costly ornament of precious metal or gems.
Find another word for opal. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for opal, like: silica, semiprecious stone, opaline, gem and jewel.