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What is this yellow and orange stone?

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What kind of stone is this?I think my uncle find it in coal mine.Stone is heavy (39 grams),opaque,shine and make groove in glass.

asked Apr 14, 2016 by vladek113 (140 points)

1 Answer

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Chalcedony or maybe agate.
answered Apr 15, 2016 by Weasel (40,320 points)

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