Perlite is a form of volcanic glass that is mined all over the world. Natural perlite dark black or grey coloured amorphous glass. Perlite is a formless volcanic glass that has moderately high water content. Horticultural perlite is made by exposing perlite to heat, which causes the trace water contained in the perlite to expand, resulting in an extremely lightweight material. Perlite is used in purposes of water drainage and gardening. (OUT OF STOCK)
