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. mineral

Anotations

Scope note:

An earthy, yellowish or rusty brown mineral found in sulphide deposits and soil or formed by the corrosion of iron. The most typical sign of active corrosion of iron objects is surface loss due to the presence of akaganeite.