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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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Color doesn't look real, perhaps some odd-colored slag material? Another option would be opal, though the color is a bit strange for opal, although not impossible. Was there any other such material present? Any way you can test its hardness or streak?
answered May 6, 2016 by hershel (47,740 points)

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