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:

Inexpensive glass, commonly of greenish or brownish color, which is caused by the presence of impurities, notably iron. It is often used to make bottles or windows. The term is derived from its resemblance to forest glass, which is also called "green glass."