well, I don't know about a rock saw, but if you have circular saw, i believe they make blades that you can put on them that are meant for cutting through stone. Just keep the stone wet with a steady supply of water and wear safety glasses and a filter mask.
Oh, and just laying the stone on a 4x4 and whacking it is likely going to leave you with a ruined stone. You would need a pretty deep score in it to keep it from breaking where you don't want it to, or you could take a ton of time breaking off very small pieces.
you should probably just go by a hardware store or Home Depot or Lowes or an equivalent and ask someone there. It will most likely save you time and money.
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