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2. Expanded clay aggregate - Wikipedia

   en.wikipedia.org/wiki/Expanded_clay_aggregate

   Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.

3. Polymer clay - Wikipedia

   en.wikipedia.org/wiki/Polymer_clay

   Polymer clay is a type of hardenable modeling clay based on the polymer polyvinyl chloride (PVC). It typically contains no clay minerals, but like mineral clay a liquid is added to dry particles until it achieves gel-like working properties. Similarly, the part is put into an oven to harden, hence its colloquial designation as clay. [1]

4. Metal clay - Wikipedia

   en.wikipedia.org/wiki/Metal_clay

   Metal clay is a crafting medium consisting of very small particles of metal such as silver, gold, bronze, or copper mixed with an organic binder and water for use in making jewelry, beads and small sculptures.

5. Trade beads - Wikipedia

   en.wikipedia.org/wiki/Trade_beads

   Trade beads from ca. 1740, found in a Wichita village site in present-day Oklahoma Nineteenth-century European trade beads found in Alaska Chugach woven spruce-root hat. Trade beads are beads that were used as a medium of barter within and amongst communities. They are considered to be one of the earliest forms of trade between members of the ...

6. Clay - Wikipedia

   en.wikipedia.org/wiki/Clay

   Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4).

7. Bead - Wikipedia

   en.wikipedia.org/wiki/Bead

   A selection of glass beads Merovingian bead Trade beads, 18th century Trade beads, 18th century. A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing. Beads range in size from under 1 ...