> From: [EMAIL PROTECTED]
> Date: Sat, 9 Dec 2000 20:24:47 -0500
>
> Speaking about Pumice (Zinc Sulphate) their is a distinction between lets say
> a Pumice stone and the chemical. Pumice is hydrophilic (water loving), and
> Iam sure if it was added to vermiculite it probably would be an ideal surface
> for any egg. JERRY
Pumice is not zinc sulphate. It's a porous glassy lava, usually quite
foamy - some kinds even float. It's used as an abrasive, among other
things. Perlite is a kind of semi-artificial pumice - it's another volcanic
glass that is popped like popcorn to make it foamier and lighter in density.
It has sealed as well as open pores, and floats.
Jon, is the pumice you describe more similar to perlite or to the calcined
clay ceramic?
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