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  3. Materials Facet
  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. metamorphic rock
  10. quartzite
  11. silcrete
Scope note
A very hard crust in or on soil formed of sand grains or pebbles glued together by silica; a quartzite.
Accepted term: 17-Jun-2024