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:

Rare halide mineral, oxy-chloride of lead, occuring as colorless, transparent striated crystals. Laurionite forms when salt water comes in contact with lead bearing slag, or as an oxidation product in lead ore deposits. The presence of laurionite in some ancient Egyptian cosmetics suggests that the mineral was purposely synthesized by the Egyptians using "wet" chemistry.