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J-tube material

 
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Would countertop material such as; slate, granite, or better still soapstone make a suitable J-tube? Coud it take the blast of heat?
 
gardener
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Location: latitude 47 N.W. montana zone 6A
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Soapstone is the only one that might work...   not sure.   Cost of soapstone versus cost of firebrick ... firebrick is less.  Fireclay and perlite are cheaper yet.  
 
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Well, soapstone is a very good heatsink. So it would rob the heat from the fire.

I'm not too sure about it either.

And, insulated soapstone might not withstand the heat and turn back to talcum powder.  
 
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