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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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Examples
The glass installed here should be opal or sufficiently textured to obscure the view in.
They even noodled for opal and are looking forward to their next visit next year.
The council sat silently while he passed out an onyx and an opal to every one.
I was cycling through the twilit back fields of Canterbury past milk opal bonfires on my way to visit Toni in her caravan.
My late husband, Milton, loved cutting opals, was very good at it, and developed a nice business as an opal cutter.
In a blinding flash the diamond, moonstone, opal, ruby and sapphire were molded together, inseparable, forever.

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