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ANSWER: perlite

The answer PERLITE has 0 possible clues in existing crosswords. See additional results below.

Possible Dictionary Clues
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 aggregate, in fire-resistant insulation, and in soil for potted plants.
A form of obsidian consisting of glassy globules, used as insulation or in plant growth media.
Perlite description
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its low density after processing.
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