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:

Multi-colored transparent or translucent material containing calcium fluoride, commonly occurring in massive crystalline cube form with perfect octahedral cleavage, used as flux, as a source of fluoride compound, and in the preparation of opalescent and opaque glass, vitreous enamel, and a purple pigment.