Produced by the extrusion of high-silica rhyolite lava, perlite is a light-grey, glassy rock, with a pearly lustre and a concentric fracture. Its physical and chemical properties enable it to be used in many applications such as filtration and horticulture, although the majority of perlite is used in formed construction products such as pipe, roof and board insulation.
Origin
Unknown
Journal Title
Ind Minerals July 2002 19
Sector
General
Class
G 2550