A new mechanism is proposed to explain the formation of growth spirals in controlled melt‐grown crystalline samples of Ba4SrNb10O30. Several distinguishing features of these spirals cannot be explained on the basis of the classical core‐first growth theory. These features are examined in detail, especially in comparison with the inherent or implied features of the classical spiral model. Characteristics of the spirals are predicted based on solidification theory and are found to agree with the observed results.