Here you will find one or more explanations in English for the word Opal.
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Opal
Opal O"pal, n. [L. opalus: cf. Gr. ?, Skr. upala a rock,
stone, precious stone: cf. F. opale.] (Min.)
A mineral consisting, like quartz, of silica, but inferior to
quartz in hardness and specific gravity.
Note: The precious opal presents a peculiar play of colors of
delicate tints, and is highly esteemed as a gem. One
kind, with a varied play of color in a reddish ground,
is called the harlequin opal. The fire opal has colors
like the red and yellow of flame. Common opal has a
milky appearance. Menilite is a brown impure variety,
occurring in concretions at Menilmontant, near Paris.
Other varieties are cacholong, girasol, hyalite, and
geyserite.
Meaning of Opal from wikipedia
