Minerals Other Than Silica and Clay

In addition to silica and clay minerals, the subsurface contains a variety of minerals (e.g., oxides, carbonates), which may react with organic and inorganic contaminants. GiUces (1990), summarizing the properties of the metal oxides in earth 

Other major components found in the subsurface include significant quantities of relatively high surface area, soluble calcium carbonate (CaCOj), and calcium sulfate (CaSO ). It is difficult to estimate the contribution of amorphous materials 

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