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Broken marble pieces can easily be reassembled with a bit of ingenuity and some help from a special cyanoacrylate glue.
Start by cutting out a piece of plastic storage bag to fit underneath the assembled pieces. This will prevent the reassembled marble from sticking to the surface beneath it. Reassemble the broken pieces on top of the plastic footprint.
Roll out a snake of modeling clay and push it around the outside edge of the reassembled pieces. This will help to hold the pieces together while the glue sets.
Fill the cracks with a super-thin, instant-set cyanoacrylate adhesive, using a long, fine dispensing nozzle. In a matter of seconds, the broken pieces of marble are reformed into their original shape!