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I'd agree with the above. Scuff the surface of the marble/granite piece used with silicon carbide (black) sandpaper if you use that to give the glue a good grip. May not be required, but it would...

I can't comment on the breaking, but in my opinion, it is always nice to glue a stone to a base, unless you have a reason to use it hand held and want to get to both sides.

The only stones I...