opal

As a proper noun oral

is of american usage, ultimately derived from aurelius .

As a noun opal is

opal.

As a noun opal is

opal.

As an adjective pearlescent

is pearl-like, either in color or luster.

As a noun opal is

opal.

As nouns the difference between moonstone and opal

is that moonstone is (mineral) a translucent gemstone, an orthoclase feldspar, that has a pearly lustre while opal is opal.

As nouns the difference between opal and hyalite

is that opal is opal while hyalite is (mineral) a form of opal.

As a noun opal

is opal.

As a verb opalized is

(opalize).

As an adjective opalized is

converted into a form of opal or chalcedony.

As a noun opal

is opal.

As a verb opalize is

to convert into a form of opal or chalcedony, especially to convert wood into such a fossilized form.

As nouns the difference between opal and geyserite

is that opal is a mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O while geyserite is a type of stone, a mixture of quartz and opal deposited by a geyser as it precipitates out of the boiling water.

As a proper noun Opal

is {{given name|female|from=English}} from the precious stone, invented in the nineteenth century.