silica, semiprecious stone, opaline; see gem 1,
Types of opals include: fire, precious, noble,
harlequin, black, common, resin, pitch, wood, cacholong,
girasol, hyalite, geyserite, menilite.
"opal." YourDictionary, n.d. Web. 05 August 2019. <https://thesaurus.yourdictionary.com/Opal>.
opal. (n.d.). Retrieved August 05th, 2019, from https://thesaurus.yourdictionary.com/Opal
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