Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by form
6. materials by chemical form
7. elements

Anotations

Scope note:

Non-metallic solid element, atomic number 5, symbol B, with several specialized uses, such as in alloy steels, in semiconductors, and in commercially valuable compounds such as borax and boric acid. It is usually prepared as a brown powder, but when very pure it forms hard, shiny, dark crystals.