perlite

  1. Home
  2. top of the aat hierarchies
  3. Materials Facet
  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. igneous rock
  10. [igneous rock by origin]
  11. extrusive rock
  12. pyroclastic rock
  13. volcanic glass
  14. perlite
Scope note
A volcanic glass that contains about 75% silica and usually has a higher water content than obsidian; found in Oregon and California. Commercially, the term refers to volcanic glass that will expand or "pop" when heated to form a lightweight aggregate.
perlite
Accepted term: 06-May-2024