Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. animal material
8. keratinous material

Anotations

Scope note:

Material derived from the shells of certain turtles and tortoises, sometimes utilizing the entire shell. Differs from the material "tortoise shell" in the way it is prepared and its finished appearance; also often derived from different species than is "tortoise shell."