Crystallization processes in silver-ion conducting superionic borate and phosphate glasses are presented. Experimental evidence indicates that these processes are determined by the dopant concentration x, glass former, molar ratio of modifier to former eta = [Ag2O]/[P2O5], cooling rate of the molten glass during preparation, and by the thermal history of the glass. A crystal-free material is produced by the press-quenching method, in which the total concentration of AgI does not exceed 64-65 mol %. Rapid quenching of highly-doped borate glasses results in the formation of alfa-AgI crystallites in the glass. The phase deteriorates when stored for a long time or after pressure operation. Annealing prompts crystallization in solid glasses when they contain 40 < x < 65 mol % of dopant. Only surface crystallization takes place when 0 < ? < 1. In the 1 < eta < 2 range, the surface crystallization of gamma-AgI dominates, provided the annealing time is not too long. When the concentration of the modifier Ag2O is high eta > 2), the crystalline phases precipitate in the glass bulk. Investigations point to the key role of a rigid substructure in crystallization. Some of the results indicate that primary crystallization is preceded by a precrystallization stage.