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

Narrower term/s

• whewellite

Anotations

Scope note:

A salt of oxalic acid, calcium oxalate can form naturally on calcareous stones as a reaction to oxalic acid excretions of mosses and lichens. In a conservation context, calcium oxalate is generally considered in its role as a form of bioterioration but its cultivation as a protective film for limestone surfaces has been investigated as well.