Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing.
greensmokers Reviewed by greensmokers on . Perlite question What exactly is it made of. I mean could you take a styrofoam block and grate it into small peices and use it . Or is there somthing special about it? Rating: 5