perlite

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English[edit]

Etymology[edit]

From French perle (pearl) + -ite

Noun[edit]

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Wikipedia

perlite (plural perlites)

  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.
    • 1928, Lawrence R. Bourne, chapter 4, Well Tackled![1]:
      Technical terms like ferrite, perlite, graphite, and hardenite were bandied to and fro, and when Paget glibly brought out such a rare exotic as ferro-molybdenum, Benson forgot that he was a master ship-builder, […]

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Italian[edit]

Etymology[edit]

perla +‎ -lite

Noun[edit]

perlite f (plural perliti)

  1. (mineralogy) perlite