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
7. metal
8. [metal by form]

Anotations

Scope note:

Mass of any type of metal, cast into convenient shape for storage and transportation, to be rolled, forged, melted, or otherwise processed later. In some periods and cultures, such as in China, ancient Italy, and parts of Africa, they have been used as currency and as ceremonial objects.