Are opals found as an ore?

Opals are not typically classified as ores, as they are not mined for metals or minerals but rather valued for their unique aesthetic qualities. They form through the deposition of silica in a gel-like state, often found in sedimentary rocks or volcanic ash layers. Opals are usually extracted from opal fields or deposits, rather than being sourced from traditional ore deposits like metals. Their extraction often involves careful mining to preserve their delicate structure and color play.