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. sedimentary rock
9. [sedimentary rock by composition]
10. carbonate rock
11. limestone
12. [limestone by composition]
13. [limestone by composition: aggregate type]
14. sinter
15. travertine

Anotations

Scope note:

A vividly colored and strongly patterned travertine quarried in Algeria and widely diffused in the Roman Empire. Alabastro a pecorella means little sheep alabaster, but it is the richly coloured bushy growths of iron and manganese oxides that are more distinctive, sometimes giving an almost three dimensional effect.