It is possible to grow crystals in two-dimensional monolayers floating at the airwater interface. When they are made of an optically active substance, they happen to do this by spiralling inward. I suggest that this is due to a permanent bending of those crystals, coming from an inhomogeneous distribution of impurities in the solid phase. This is in relation with the optical activity through the nonsymmetric dependence of the line tension at the growing tip controlling growth via the Gibbs-Thomson condition.
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Yves Pomeau (1987) studied this question.
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