Abstract

An optical study of the morphology of etch pits and a study of the etch rates at constant temperature for the controlled dissolution of calcite cleavage surfaces by lactic acid of various concentrations are presented. It is shown that the lactic acid acts preferentially at dislocations which terminate on a cleavage surface. Furthermore, it is found that isotropic and anisotropic etch rates increase with initial increases in lactic acid concentration, attain maximum values and then decrease with a further increase in lactic acid concentration. A detailed analysis of the factors which lead to this variation is presented.

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