On the Growth and Dissolution Shapes of Spherical Shell Crystals and the Shapes of Etch Pits on Crystals

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It is shown, based on our previous considerations on the relationships between the growth shape and anisotropy of growth rates and between the dissolution shape and anisotropy of solution rates, respectively, in slowly dissolved and in slowly grown crystals, that the final or limiting shape in slow inward dissolution (e. g. the slow dissolution of a sphere crystal) and in slow inward growth (e. g. the slow growth of the inner surface of a spherical shell crystal) is a polyhedron surrounded by planar faces subtended among neighboring principal crystallographic directions, while that in slow outward growth (e. g. the slow growth of a sphere crystal) and in slow outward dissolution (e. g. the slow dissolution of the inner surface of a spherical shell crystal and the formation of etch pits) is a polyhedron surrounded by planar faces normal to principal directions. These conclusions are found to accord well with observations.
東北大学の論文