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," ...

Those little squishy white balls in your potting soil aren’t styrofoam. They’re actually perlite, AKA volcanic popcorn. In the building industry, perlite is used in ceiling tiles and lightweight ...

Does Perlite make a difference? A military operation Americans didn’t expect, didn’t want and didn’t vote for Libya’s top general killed — here’s what we know How fake admiral was caught out by ...