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

Narrower term/s

• [clay by product][+]
  • brick (clay material) [+]
    • [brick by function] [+]
      • air brick
      • backing brick
      • capping brick [+]
      • building brick (clay products)
      • engineering brick [+]
      • face brick [+]
      • fire brick
      • floor brick
      • furring brick
      • paving brick [+]
      • pilaster brick
      • kiln brick (brick)
    • [brick by technique] [+]
      • [brick by technique: drying process] [+]
      • [brick by technique: shaping process] [+]
    • [brick by form] [+]
      • [brick by form: shape or size] [+]
      • [brick by form: solidity] [+]
    • [brick by location or context] [+]
      • closer [+]
    • [brick by color or material] [+]
      • red brick (material)
      • white brick (material)
      • yellow brick (material)
  • torchis
  • terracotta (clay material) [+]
    • architectural terracotta
    • glazed terracotta
  • cob (clay mixture material)
  • [ceramic and ceramic by product] [+]
    • [ceramic by product] [+]
      • Coade stone
      • ceramic tile [+]
    • ceramic (material) [+]
      • porcelain (material) [+]
      • biscuit (porcelain, material) [+]
  • grog
• [clay by function][+]
  • potter's clay
  • fireclay (clay)
  • bole (clay) [+]
    • Armenian bole
• [clay by composition or origin][+]
  • ball clay
  • banco (clay)
  • catlinite
  • kaolin
  • malm
  • marl
  • slip (clay) [+]
    • Albany slip clay
    • bentonite
  • pozzolana (clay) [+]
    • metakaolin
  • pipe clay
  • fuller's earth
  • terre de Lorraine
  • unfired clay
  • native clay
  • gault
  • cement-stabilized clay
  • silver clay

Anotations

Scope note:

Naturally occurring sediments that are produced by chemical actions resulting during the weathering of rocks. Clays are composed of hydrated aluminum silicates, such as Kaolinite, Illite, Palygorskite, Attapulgite, Bentonite, and Montmorillonite. Small amounts of other minerals can change the color (white, yellow, brown or red) and texture of the clays. Clays may include all earths that form a paste with water and harden when heated.