PERLITE

Perlite

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 light weight after processing.

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perlite

Noun

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


The above text is a snippet from Wiktionary: perlite
and as such is available under the Creative Commons Attribution/Share-Alike License.

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