[Cob] vermiculite, pumice, perlite suppliers?

[WALTER WARD]

> Does anyone have any experience or suggestions of what
> I should be asking for ?
Any supplier of concrete blocks should be able to get (or have on hand) 
large (6 cu ft) bags of perlite which is used as insulation in the void 
spaces of the concrete blocks.  Perlite works well as an insulation even 
when incorporated into a matrix.
Walt