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At an excess vapor density (supersaturation of about 10-4) adjacent to the ice crystal surface of 5–6×10-10 g/cc, there is a transition between the highly faceted kinetic growth form and the rounded equilibrium form at temperatures above –6 °C. At lower temperatures there is a transition in the equilibrium form to hexagonal prisms because of a reduction in the disordered surface layer. The growth rate of ice crystals from the vapor is analyzed by a simple model which accounts for vapor flow and surface processes separately. The conditions for highly temperature sensitive growth are identified from the model.