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WITH 3 PLATES SummarySamples from fifteen salt crusts from the central Great Konya Basin, Turkey, were studied in the laboratory. Chemical analyses data were combined with the results of X-ray diffraction.In the mineralogical systems studied, three types of salt efflorescences of different morphology were distinguished, with mirabiliteithenardite, bloedite, and bloedite/epsomite/halite as major mineral associations. These crusts seal the surface soil more or less effectively, thus reducing evaporation and thereby preventing cracking of the saturated soils. The effectiveness of this sealing depends on the morphology of the accumulated salt minerals rather than on their chemical composition. Reclamation of salt-encrusted spots therefore requires understanding of the mineralogy and the morphology of the efflorescent salts. IntroductionALTHOUGH up to now much attention has been paid to salt effects on soils in arid and semi-arid regions, the mineralogical composition and the morphology of the efflorescent salts has hardly been studied. In the course of investigations on salt-affected soils in the Great Konya Basin, Turkey, it became evident that the morpholo and the solubility of the various crystalline phases possible in s u c r multi-component systems are of greater importance than had previously been realized

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