Abstract
When the surface of sodalite [Na8(Si6Al6O6)Cl2] crystals was treated with an etching solution, growth of NaCl crystals could be observed. The etchant used is a dilute nitric acid solution. The acid attacks the surface and breaks it down into an Si–Al gel in which the crystals grow rapidly. Optical photography and electron-microprobe images show crystals with steplike patterns and hollow depressions at the centres of crystal faces. Preferential growth and aggregation of crystallites at grain boundaries is distinctly observed.
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