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T10+notes - Soil Mineralogical Properties (Topic 10) Soil...

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Soil Mineralogical Properties (Topic 10) Soil chemical properties are largely regulated primarily by the clay fraction . In some soils, the clay may be a small fraction of the total volume, but it is still the most important component. Important properties of clays 1. Size - extremely small size (<2-microns or <0.002 mm) - individual particles can only be seen with an electron microscope 2. Surface Area - extremely high surface area - ranges from 10 to >800 m 2 /g 3. Surface Charge - most clays have a negative charge; a few clays have a small positive charge Most common types of clay minerals 1. Layer silicate clays 2. Iron and aluminum oxides/hydroxides Layer Silicate Clays - crystalline minerals with a layer-like structure. Each clay particle is made up of a series of layers much like the pages of a book. They are the dominant type of clay minerals in weakly to moderately weathered soils, such as young soils and soils of the temperate region. Layer silicate clays are composed of two types of horizontal sheets:
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This note was uploaded on 01/27/2011 for the course SSO 10 taught by Professor Randydahlgren during the Fall '10 term at UC Davis.

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T10+notes - Soil Mineralogical Properties (Topic 10) Soil...

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