A natural volcanic glass similar to obsidian but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form perlite is used as a lightweight aggregated, in fire-resistant insulation, and in soil for potted plants.
PERLITE, ALSO PEARLITE
Meaning of PERLITE, ALSO PEARLITE in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012