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. metal
8. [metal by composition or origin]
9. nonferrous metal
10. [calcium and calcium compounds]
11. calcium compounds
12. calcium phosphate

Anotations

Scope note:

A complex calcium phosphate, a naturally occuring mineral form of calcium apatite, that serves as an important component of tooth enamel and vertebrate bone. In an archaeological context, hydroxyapatite from human and animal remains is studied to reconstruct ancient diet.