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. [sodium and sodium compounds]
8. sodium compounds
9. sodium chloride
10. [sodium chloride by form]

Anotations

Scope note:

Sodium chloride that occurs naturally as, or obtained mechanically from, a mineral deposit and sold as large crystals. Rock salt is used to melt ice, as a food preservative, and for the production of soda ash by the glass industry. To refer to the mineral composed of sodium chloride, use "halite."