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. glass (material)
8. [glass by composition or origin]

Anotations

Scope note:

A naturally occurring yellow or greenish glass made of silica found in parts of the Libyan Desert, the Western Desert of west Egypt, and along the Libyan-Egyptian border. Its origins remain a debated issue within the scientific community, but may be the result of a meteor impact fusing desert sand. The glass was used as a gemstone by the ancient Egyptians, and also as a material for paleolithic tools.