We determined specific surface free energy of equilibrium form crystal such as chlorapatite or ruby using contact angles of liquid droplets. Because such specific surface free energies satisfies Wulff’s relationship, the validity of experimentally determined specific surface free energy was certificated. This time we applied our experimental technique for determination of the specific surface free energy even for growth from crystal. We used synthetic quartz crystal produced by Nihon Dempa Kogyo with rough and meta-stable faces (Z, S, +X, -X). Contact angles of water and formamide droplets on each meta-stable face were determined by sessile drop method with droplets in size of 0.1 micro liters. The specific surface free energy was calculated using Fowkes approximation and Wu’s mean equation and compared with growth rate of the quartz crystal. The order of specific surface free energies were -X <+X <Z<S, and the growth rate had the same order. Therefore, we can say that the growth rate of each face of the crystal is determined by the specific surface free energy. Although our experimental measurement of the specific surface free energy was performed at room temperature, the quartz was synthesized at higher temperature. Because there is no phase transition between the synthesis and room temperature, the order of the specific surface free energy of each face might be kept even at room temperature.

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