Texture formation in mineral bearing rocks was simulated using a quantitative phase-field model of eutectic growth with two solid phases in a melt. An application of the multi-phase approach allows also simulating systems with many different crystals of one solid phase which do not coalesce during the growth. In nature, specific layering microstructures were observed for which many explanations are possible, one of which is the fluctuation in the crystal size, which we verify by phase-field modeling. In this work, we show by numerical experiments that, due to the formation of the initial layer of the solid phase with crystals of larger size, these crystals will grow faster at the expense of smaller crystals and a layer with increasing fraction of a phase “b“  will form on top of the initial layer of a phase “a“. Simultaneously, a new layer with increasing fraction of the phase “b“ will form on the top of the previous layer. Thus, a layering structure may be obtained. The formation of the layering structure was possible to be observed by simulation using both the three-phase and multi-phase method. The conditions and parameters of the model necessary for the formation of layers are discussed.