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:

A yellow earth mineral that occurs naturally as an opaque crystalline material, primarily composed of iron hydroxide and varying in color from red to yellowish-brown. It is used for pigment and large clumps have also been carved for small ornamental items.