Add Yahoo as a preferred source to see more of our stories on Google. Tiny White Ball Shaped Perlite Potting Soil. You may wonder about perlite soil and what it is made of. Maybe you are familiar with ...

Perlite is a volcanic glass that is often used in gardening due to its lightweight, porous nature that aids in healthy plant development. "It is made from a type of volcanic glass called obsidian," ...

EXPANDED perlite, which is made by rapidly heating small particles of suitable volcanic glass, has recently been used extensively as a lightweight aggregate for gypsum plaster and concrete in the ...