Blackboard slate
Esquema
Jerarquía
<materials by composition> > inorganic material > rock > metamorphic rock > slate (rock) > <slate by form or function>
Descripción
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.
URI original del concepto
Otros términos
- schoolbordleisteen [nl]
- pizarra de pizarrón [es]
- slate, blackboard [en]