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See: http://www.crest.org/discussiongroups/resources/stoves/Boyt/ceramics/ceramics1.html You could spend a lifetime studying clay and its uses. Clay is basically the stuff in dirt that is non-organic, and not sand and rocks. It is always associated with water, but dried-up lakes and streams are the best sources. Clays used by Southwestern Anasazi is a mystery. A thousand years ago they made pottery just millimeters thick that survives today. Nobody (the legend goes) knows the source of this white clay. But some clay as polymer and modlying clay is made out of chemical h2o and rubber.

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16y ago

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