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. igneous rock
9. [igneous rock by origin]
10. extrusive rock
11. pyroclastic rock
12. tuff

Anotations

Scope note:

Volcanic rock produced by the largest known trachytic phreatoplinian eruption and composed of zeolites such as phillipsite and chabazite. Neapolitan yellow tuff represents the most used building stone of the historical monumental heritage of Naples and also constitutes a significant part of the city modern architecture.