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There is a place in that town called American Glass That may be where both of the rocks came from i Think the green one was part of the wall of their furnace .If so the black rock was broken out after the glass cooled and just glass. But leave your post open you may have a big black Diamond LOL Osage
Your photos seem to show the green is part of a larger grey-ish stone, and so is the black.
The green appears to be Olivene, which usually occurs in Granite matrix.
Need to see some close-up photos of the black one, for certainty. Obsidian isn't usually seen on grey rock.