Bosbach, D.; Jordan, Guntram; Rammensee, Werner
Crystal growth and dissolution kinetics of gypsum and fluorite: an in situ scanning force microscope study.
In: European Journal of Mineralogy, Vol. 7, No. 2: pp. 267-276
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Scanning force microscopy was used to study the dissolution and growth in situ on cleaved surfaces of gypsum and fluorite in aqueous solution at room temperature. Three different dissolution processes can be distinguished: displacement of cleavage steps parallel to the investigated sample surface (process I) and the formation of terrace vacancies which correlate with point defects and linear defects (process II). Both these processes can be observed on the gypsum (010) and fluorite (111) surfaces. The formation of etch pits (process III) probably related to screw dislocations, occurs frequently only on the fluorite (111) surfaces. -from Authors