Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by form]
6. [materials by chemical form]
7. compounds (materials)

Anotations

Scope note:

Oxide of magnesium, a highly refractive, white, powdery material used in ceramic glazes, bricks, magnesia cement, and other industrial processes. In paper conservation, magnesium oxide has been used as a nonaqueous alkalization agent.