| Subject | English | Spanish |
| industr., construct. | black opal | ópalo negro |
| chem. | black opal | ópalo de tinte negro |
| industr., construct. | fire opal | ópalo de fuego |
| industr., construct., met. | flashed opal | vidrio opal doblado |
| industr., construct., chem. | fluoride opal glass | vidrio opal al flúor |
| industr., construct. | gold opal | ópalo de oro |
| industr., construct. | mass opal | masa de ópalo |
| el. | opal bulb | ampolla opal |
| gen. | opal glass | vidrios opales |
| pack. | opal glass | lechoso |
| pack. | opal glass | ópalo |
| chem. | opal glass | vidrio opalino |
| chem. | opal glass | vidrio lechoso opalino |
| el. | opal glass | vidrio opal |
| pack. | opal glass | vidrio mate |
| gen. | opal glass | vasos de ópalo |
| el. | opal lamp | lámpara opaline |
| el. | opal lamp | lámpara opal |
| med. | opal-like | opalescente |
| gen. | opal-like | que parece de ópalo o que exhibe diversos colores como él |
| industr., construct. | opal matrix | ópalo matrix |
| genet. | opal mutant | mutante ópalo |
| industr. | opal-wax | aceite de ricino hidrogenado |
| industr. | opal-wax | opalwax |
| commer. | opal wax | cera de ópalo |
| commer. | opal wax | aceite de ricino hydrogenado |
| chem. | opal-wax | opal wax |
| industr., construct., chem. | phosphate-opal glass | vidrio opal de fosfato |
| industr., construct., met. | pot-opal glass | vidrio opal en masa |
| industr., construct., met. | pot-opal glass | vidrio opacificado en masa |
| industr., construct. | water opal | ópalo de agua |
| industr., construct., chem. | white phosphate opal | vidrio opal al fosfato |