On 05 Feb 2005, at 09:12 AM, Andy Easton wrote:
All perlite is, is heat expanded pumice but it releases its moisture very readily.
Perlite and pumice are different kinds of substances. Indeed, both are silicaceous, but the subsequent similarities are superficial, and their relative horticultural values differ. There are a lot of readily accessible sources of good information on both perlite and pumice. A couple of good starter sites are:
http://www.perlite.net/
and
http://volcanoes.usgs.gov/Products/Pglossary/pumice.html
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