Etch pits formation, theory

Concurrently, after reviews of the theories of etch-pit formation, I.asaga (1983) and Helgeson et al. (1984) concluded that the rate of mineral dissolution can he... 

One proposal for IGC is related to crystallographic etch pit formation at grain boundaries. According to this theory, grain boundary susceptibility is related to the crystallographic facet exposed on the boundary and the different rates of dissolution of such facets. Bicrystal studies as... 

We describe here an experiment which indicates that the dislocation etch pit theory is a useful tool in interpreting formation of... 

We have seen above that the kinetics of mineral dissolution is well explained by transition-state theory. The framework of this theory and kinetic data for minerals have shown that dissolution is initiated by the adsorption of reactants at active sites. Until now these active sites have been poorly characterized nevertheless, there is a general consensus that the most active sites consist of dislocations, edges, point defects, kinks, twin boundaries, and all positions characterized by an excess surface energy. Also these concepts have been strongly supported by the results of many SEM observations which have shown that the formation of crystallographically controlled etch pits is a ubiquitous feature of weathered silicates. 

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