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- Nov 30, 2016
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No doubt many of you are familiar with these stunning brightly coloured and patterned agate pebbles from Madagascar. They look too good to be true and perhaps they are. There is talk that they have been heat treated, soaked in a sugar solution and then boiled in a sulphuric acid solution to produce their colours. I own a couple and I'm not sure - is anyone across this? Cheers, Ed