precious opal

noun

1. any opal having a play of colors, used as a gemstone.

Example Sentences

“I took my camera and lenses, and my DJI drone, along with a number of bottles of Nevada precious opal.”

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"When our state's inland sea evaporated millions of years ago, it provided a unique silica-rich environment for the creation of precious opal. It is these exceptional conditions that created the Fire of Australia."

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Highly acidic fluids dissolved silica from quartz-rich sandstones that then later precipitated as precious opal.

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Most gem-stones are harder than quartz, though precious opal, turquoise, moonstone and sphene are inferior to it in hardness.

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The settlement had weathered seasons of dearth, and had existed on the merest traces of precious opal before; but this one had lasted longer, and had tried everybody's patience and capacity for endurance to the last degree.

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