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Secondary Clay

Clays that have been transported by water from the site of their primary alteration and settled into layers. They are classified according to the geological period in which they were formed. Nature purifies these clay mechanically, removing gravel and sand, but contaminates them chemically or at the ultimate particle level, adding iron and fluxes. Vast deposits of secondary clays can be found in many places and materials having a wide range of properties can layer right next to each other. Ball clays, earthenwares and stonewares are secondary clays.

Out Bound Links

  • (Glossary) Stoneware

    Most often the term stoneware refers to a high fir...

  • (Glossary) Earthenware

    A clay fired at low temperatures (cone 010-02) whe...

  • (Glossary) Terra cotta

    'Terra Cotta' (Italian for 'cooked earth') is red ...

  • (Minerals) Ball Clay

    Ball clay is the most common type of secondary cla...

  • (Glossary) Primary Clay

    Kaolinite is the closest thing we have to pure cla...

In Bound Links

  • (Glossary) Fireclay

    A refractory naturally occurring secondary clay. F...

By Tony Hansen

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