In article <4b57nd$r9t$1@mhade.production.compuserve.com>, 76072.3141@CompuServe.COM says... > >Anybody know about any practical thermal applications utilizing >Zeolite? It's a clay-type mineral that's supposed to be able to >'store' 600+ times more BTU's as water. Thankyou for any >information or direction where I might search. I don't know if it works, but zeolite is cheap and is sold for organic agricultural fertilizer use under the name greensand.