I am surprised a bandsaw would not work well. Since butchers use it all the time to cut through frozen meat and bones. It cuts directly through the bones which is basically calcium bone structure. Can't imagine rock (i.e. Calcium carbonate) is not cuttable.hmm thanks everyone. I was told that a bandsaw wouldn't work well.
i'll try a handsaw and a hammer/chisel combo
I've got a professional bandsaw with a 14" clearance but you'd have to buy the blade.