Volcanic rock is formed from magma erupting from a volcano. Volcanic rocks are often used as soil amendments, in decorative landscaping and also for drainage and filtration purposes.
Perlite is a naturally occurring siliceous rock when heated over 1500 degrees Fahrenheit, the tiny glassy minerals expand up to 20 times its original size due to trapped water inside trying to evaporate.
3/16" Scoria (Black)
3/16” Scoria (Black) is a volcanic rock that gets its appearance from the simultaneous rapid cooling and depressurization process after being ejected out of a volcano. 3/16” Scoria contains small vesicles, which is what causes it to be so light in weight. These vesicles help to retain nutrients and moisture when used as a soil amendment.