perlite
(noun)
noun
1. (mineralogy) An amorphous volcanic glass formed by the hydration of obsidian.
2. The lightweight insulating material and aggregate resulting from expanding perlite glass by heat.
(noun)
1. (mineralogy) An amorphous volcanic glass formed by the hydration of obsidian.
2. The lightweight insulating material and aggregate resulting from expanding perlite glass by heat.