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. rock (inorganic material)
8. metamorphic rock
9. slate (rock)
10. [slate by color or quality]

Anotations

Scope note:

Slate that is distinguished by the light colored stripes or ribbons running through it. It was prized as a material in bannerstones and other ancient American ceremonial objects. When used in construction, it is known for being less durable than other slates because the ribbons are weaker than the surrounding dark areas.