opal
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
Other meanings
A precious , an iridescent found in the opal-silica mineral substrate ()
The colour of opal: any shade of blue with bright flecks of other colours, such as white, yellow, and red.
A kind of
- mineral
- opaque gem
Kinds of opal
- black opal
- fire opal
- harlequin opal
Related words
- chloropal
- Grawin Opal Fields
- opaled
- opalescence
- opalescent
- opalesque
- opaleye
- opalic
- opalise
- opalish
- opalize
- opalotype
Word history
From Sanskrit "उपल" (gem, stone).
Where this comes from
This definition is adapted from “opal” on Wiktionary, by its contributors; related-word lists use Open English WordNet (CC BY 4.0, based on Princeton WordNet), published under CC BY-SA 4.0. This page is published under the same licence.