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What is an opal?

What is an opal? Here are some definitions.

Noun
  1. (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
  2. (biology) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
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In a blinding flash the diamond, moonstone, opal, ruby and sapphire were molded together, inseparable, forever.
Matrix opal is only found at Andamooka and is generally cut and sold en cabochon.
I was cycling through the twilit back fields of Canterbury past milk opal bonfires on my way to visit Toni in her caravan.
It shimmered through the multicoloured opal to bathe the area in a spectrum of colours.
Glenn had steered her away from the traditional solitaires and selected an estate piece, a huge opal surrounded by diamonds.
Such a structure reflects light in unusual ways similar to mother-of-pearl or the gemstone opal.

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