Abstract
The occurrence of quartz in soils and pedological formations, booth as primary residual mineral and as a secondary neogenesis constituent, is not fully explained at the moment. The subject has been studied experimentally using cristobalite as a source of silica in conditions of water or solutions flux. From a kinetic analysis, three main aspects are shown and discussed : — The first one is related to the experimental formation of quartz. A domain of occurrence in relation to amorphous silica is defined and conditions of crystallization are precised. — In the second one, the problem of a possible competition between heterogeneous quartz nucleation and metal adsorption on cristobalite surface (mainly Al) is studied. — The problem is extended to the more general competition between adsorption phenomena and silicate neoformation processes.
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