Rock and crystal surfaces growing freely into a body of a standing fluid such as a water filled vug can form a number of different morphologies. One of the main controls on shape is whether growth is reaction limited or limited by a diffusive field in the aqueous phase.

The simplest possible growth system is that of continuous, homogeneous, isotropic growth at a free surface, with no time varying boundary conditions or interactions with external or internal fields. This is of course an abstraction, not likely to be found in nature. In such a system, the patterns would be completely...

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