perlite definition

  • noun:
    • an all natural volcanic glass comparable to obsidian but having distinctive concentric cracks and a comparatively high water content. In a fluffy heat-expanded type perlite is employed as a lightweight aggregate, in fire-resistant insulation, plus in soil for potted flowers.
    • An amorphous volcanic glass formed because of the moisture of obsidian
    • The lightweight insulating material and aggregate caused by growing the cup by heat.
    • just like pearlite.
    • A peculiar kind of certain vitreous rocks, like obsidian and pitch-stone, the size of which often assumes the form of enamel-like globules.
    • See pearlite.

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