William Posted May 24, 2021 Report Share Posted May 24, 2021 Marble is 0.66 and has the same black "material" as the Rainbo I posted, only in little chunks on and below the surface. What do we have here? Link to comment Share on other sites More sharing options...
Ric Posted May 24, 2021 Report Share Posted May 24, 2021 It looks like some type of impurities - it's not so uncommon to find stuff like this in a marble -unless it's actually mica in an old hand-made. It is much less common when you see it in the form of a patch, or a ribbon, like that last Pelt you showed. Link to comment Share on other sites More sharing options...
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