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We describe a novel crystal growth instability that enhances the developmentof thin edges, promoting the formation of plate-like or hollow columnarmorphologies. This instability arises when diffusion-limited growth is coupledwith structure-depdendent attachment kinetics, specifically when the nucleationbarrier on a facet surface decreases substantially as the facet widthapproaches atomic dimensions. Experimental data are presented confirming thepresence of this instability in the growth of ice from water vapor at -15 C. Webelieve this edge-enhancing effect plays an important role in determining thegrowth morphologies of atmospheric ice crystals as a function of temperature, aphenomenon that has been essentially unexplained for over 75 years. Our modelof structure-dependent attachment kinetics appears to be related to surfacemelting, and thus may be present in other material systems, whenever crystalgrowth from the vapor phase occurs near the material melting point.

An Edge-Enhancing Crystal Growth Instability Caused by Structure-Dependent Attachment Kinetics