The internal particles and surface particles of mineral crystals are in different environments. The internal particles are surrounded by neighboring particles, valence neutral, and the gravitational force they experience is balanced, with the resultant force equal to zero. The particles on the surface are located at the interface between mineral crystals and the medium (gas or liquid), and there are broken bonds and unsaturated valence. At the same time, they are subject to the gravitational force of particles within the crystal and particles of the medium (gas or liquid), and the gravitational forces of the two are unbalanced. Therefore, not only do different minerals exhibit different surface properties but even the surface of the same mineral displays different properties from its own internal characteristics.