Mixed crystals of NaCl and KCl and grown from the water solution. The X-ray studies by Laue and powder patterns showed the existence of two phases viz NaCl and KCl in the crystals. The distribution of the phases was studied by optical and etching techniques. These observations of microstructures showed two distinct types of regions existing in stripes of varying widths. These stripes appear on (100) faces lengthwise along (100) and (110) directions. Etchants previously established for pure NaCl, produced identical etch pits on one type of the stripes, and etchants established for pure KCl produced etch pits on the remaining stripes. Thus, it is clear that the mixed crystal grown from solution is a solid different from the mixed NaCl-KCl crystal, grown from the melt which is a single-phase solid solution of the constituent phases.