This work is devoted to the study of ammonium chloride (NH₄Cl) crystallization from an aqueous solution in a stirred vessel. Initial supersaturation is created by the addition of potassium chloride (KCl) crystals into a nearly saturated NH₄Cl solution. From continuous recording of both electrical conductivity and turbidity of the medium information can be derived about the crystallization rate and the granular state of the so formed NH₄Cl crystals. These are ramified agglomerates of 5 μm primary crystals. Their size is clearly correlated with the Kolmogorov microscale. Respective roles of primary and secondary nucleation, growth, agglomeration and fragmentation are discussed in the framework of a model.