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Another option offen overlooked is dolamite rock. It is usualy a smooth pink and cheam swirly colors and is natures refractory stone. I hade mde a small forge out of this stone like a one brick forge and it worked well on small blades. It isnt that hard to cut. A masonary wheel or dry diamond sawblade in a circular saw cuts it like butter. Just aviod the stuff if it has been soaking in water for a long period of time. rain is ok.
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