Our favourite was this opaline sphere set on fine brass rods.
From the guardian.co.uk
They soar through the ceiling, project invisible backdrops of misted mountains against an opaline sea.
From the time.com
The pepper mills on the dining table, the apple-green opaline finger bowls and maybe most of all, the turquoise enamel taps in his bathroom.
From the tmagazine.blogs.nytimes.com
The theory is that volcanic activity or meteorite impact on Mars created materials that liquid water would have altered, and the result is opaline silica.
From the cnn.com
The same is true for the black opaline dial, whose homogeneity is underlined at nine o'clock by the 68-hour power-reserve indicator, echoing the red of the seconds hand.
From the techcrunch.com
The orbiter also found in 2008 a new kind of mineral, called opaline silica, which suggested that liquid water had been on Mars as recently as 2 billion years ago.