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Chemically modified mica sheets have been tested as heterogeneous nucleant surfaces for lysozyme, concanavalin A and thaumatin. Smooth mica surfaces with reduced hydrophilic properties and different density of ionisable groups have been prepared by a silanisation reaction using mixtures of n-propyltriethoxysilane and 3-aminopropyltriethoxysilane in different percentages starting from 0 to 100% of aminosilane. The crystallisation experiments were carried out with the hanging drop vapour diffusion technique. The results suggest that these mica surfaces act as heterogeneous nucleant agents, whose effectiveness is due to non-specific attractive and local interactions between charged residues of the protein and the ionisable groups on the mica surfaces.