According to classical nucleation theory, a crystal grows from a small nucleus that already bears the symmetry of its end phase - but experiments with colloids now reveal that, from an amorphous precursor, crystallites with different structures can develop.
@article{arxiv.1407.3644,
title = {Crystallization: Colloidal suspense},
author = {László Gránásy and Gyula I. Tóth},
journal= {arXiv preprint arXiv:1407.3644},
year = {2014}
}