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. mineral

Anotations

Scope note:

A vitreous, transparent or translucent mineral that is a silicate of aluminium and sodium containing sodium chloride, usually of a greenish blue color but also grey, yellow, green, or pink, and is often mottled with white veins or patches. It is found in certain igneous rocks. A component of lapis lazuli, it is also used alone as a gemstone.