(mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.

A female given name from English from the precious stone, invented in the nineteenth century.

(poetic) opalescent; misty or milky in appearance

Having a structure similar to that of opal

plural of opal

present participle of opalize

simple past tense and past participle of opalize

(transitive) To convert into a form of opal or chalcedony, especially to convert wood into such a fossilized form. / (transitive) To make opalescent.

Converted into a form of opal or chalcedony

(chiefly Australia) The women's national basketball representative team of Australia.