blackboard slate

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  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. metamorphic rock
  10. slate (rock)
  11. [slate by form or function]
  12. blackboard slate
Scope note
Select, unfading, black slate of uniform color and thickness with all edges ground and accurately squared so that joints can be made tight, smooth, and on the same plane.
blackboard slate
Accepted term: 27-Jan-2025