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  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. sedimentary rock
  10. [sedimentary rock by form]
  11. concretionary stone
  12. septarium
Scope note
A large, generally spheroidal concretion, usually made of impure limestone or clay ironstone, having polyhedral blocks that are internally cemented together by crystalline minerals.
Accepted term: 27-May-2024