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:

A mineral consisting of calcium oxalate dihydrate found as tiny white, glassy crystals. Originally found in mud at the bottom of the Weddell sea, Antarctica, which gave the mineral its name. Weddellite, and whewellite form on the surface of carbonaceous minerals in the presence of microbiological organisms such as lichens.