That is unusual... Though I wouldn't recommend an overnight soak of a Meerschaum in anything, this makes me wonder if the Meerschaum was Block or pressed Block. When cleaning up an estate Meerschaum, the cake can be removed using a sharp, blunt tipped knife or a Savinelli Fits-All-Reamer, followed by Everclear on a doubled over Pipe cleaner. A paper towel can be used to ream the remnants of the cake, as a last step in this process. I would not recommend using any glue or bonding agent to repair this cracked Pipe, as several compounds (possibly toxic)can be released in the smoke as the Pipe heats up during the smoke.