Bernhard, put it back in the kiln next time you sit down to torch, ( of course the kiln is turned on and heating) ( lol ) and after it has soaked for at least an hour at full temp, what ever you use to anneal, then try to use a large punty on one side of the crack and start melting from the other side and then reverse. I have pretty much mended things like that, that way, but not with a rock in side. I have wondered what would happen to your marbles if you put them in the freezer and then took them out to room temp. Would they crack? Try with one you don't like so much if you are curious too.
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Mary K
GTT Sidewinder & 3 Regalias
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You cannot do a kindness too soon, for you never
know how soon it will be too late.
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