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If you want wood to not crack you must remove the pith (center), wax the ends to slow the drying process, and allow the wood to fully dry. This can take years depending on the thickness and it will...

Wow! where to start?
Yes stone can be turned on a lathe, but as pixelfixed pointed out it is messy. The cracks can be dealt with by applying a thin CA to them. Marble and granite need a grinder,...