Cob: GYPSUM ADOBE CONSTRUCTION TECHNOLOGY]

[Charmaine]

porcelin clay, in most instances,  is simply Kaolin clay. available at 
pottery stores, people make teapots out of it.

commercial 50# bags of kolin can be had at builder's supplier fot $3.00 
a bag,,pale grey, the finest silica clay--also called"fire clay or 
mortar clay"..it is an additive to port cement mortars.

Ms. Charmaine  Taylor/ Taylor Publishing
http://www.dirtcheapbuilder.com    http://www.papercrete.com
PO Box 375, Cutten (Eureka) CA 95534 707-441-1632     tms at northcoast.com