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Why Do Different Crystals Have Different Shapes And Sizes?

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The size and shape of crystals depends on 2 factors. The internal symmetry of the crystal and the relative growth rates along the various directions of the crystal.

If there is a highly attractive interaction along a certain direction of a crystal, then that direction will probably grow fast. However, it could also grow slowly, if that direction interacted strongly with the solvent. If you have strongly absorbed solvent on the surface of the crystal, it could block the growth along that face.



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