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:

Naturally occurring mineral form of lead dioxide; black crystals or blackish brown masses. In mural paintings, lead-based pigments may convert to plattnerite over time, causing deterioration and blackening to the pictorial surface.