Put a strong magnet up to it and see if the "gold" pulls to it. Probably iron pirate (pyrite). Be careful you don't break the glass when the magnet pulls to it. Or you can unscrew the rod at the ends and pour it out.Then smash it to see if it crumbles.There is a small magnet at the end. Yes, these can work but they are quite awkward. Never used either of those types. Tried a spring rod which did not work on small gold target. I don't suspect these will, either.
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