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opal

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opal

Main Entry:: opal
Pronunciation:: \ˈō-pəl\
Function:: noun
Etymology:: Latin opalus, from Greek opallios, ultimately from Sanskrit upala stone, jewel
Date:: circa 1586

: a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is used especially as a gem

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