Jun 21, 2012· For more than 140 years, clay mining was a major industry in West ia. Bricks for buildings and streets, tiles and pottery were manufactured from clay mined from residual clays developed by the weathering of limestone and shale and from transported clays deposited in rivers and swamps during the marine geologic age.

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Clay is a type of fine-grained natural soil material that contains hydrous aluminium phyllosilicates (clay minerals) that develops plasticity when wet. Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to particle size and geometry as well as water content, and become hard, brittle ...

Clay mineral, any of a group of important hydrous aluminum silicates with a layer (sheetlike) structure and very small particle size. They may contain significant amounts of iron, alkali metals, or alkaline earths.. General considerations. The term clay is generally applied to (1) a natural material with plastic properties, (2) particles of very fine size, customarily those defined as ...

Clay minerals are characterized by layered structures consisting of sheets of silicon oxide alternating with sheets of aluminum oxide. Units of two or three sheets constitute unit layers. Some clay minerals, particularly the montmorillonites, may absorb large quantities of water between unit layers, a process accompanied by swelling of the clay.

The mixed-layer clay has a lattice spacing of 29.4 Å that expands to 31.0 Å when glycolated and contracts irregularly to 13.2 Å when heated to 500 °C; the clay is assumed to consist of 14 Å chloritic and 15 Å montmorillonitic material. Chlorite or mixed-layer clay, or both, generally are associated with rocks containing dolomite.

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Clay mineral - Clay mineral - Origin: All the clay minerals, with the possible exception of halloysite, have been synthesized from mixtures of oxides or hydroxides and water at moderately low temperatures and pressures. Kaolinite tends to form in alumina-silica systems without alkalies or alkaline earths. Illite is formed when potassium is added to such systems.

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