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:

Melanterite is hydrated iron sulfate formed after decomposition of pyrite or other iron materials by action of surface waters in mines. It occurs as dull, translucent green crystals on mine walls. Formerly used to make an inky pigment, melanteria.