In section 3.1 we briefly describe classical nucleation theory (CNT), the thermodynamic and kinetic framework for classical nucleation. For the purposes of classifying nucleation pathways, we stress that classical nucleation is a single-step process that takes place through the attachment of monomers from solution to a cluster with an internal structure matching the bulk crystal. Within the capillary approximation, the surface tension of the clusters of a new phase is independent of cluster size and also matches the bulk; we should expect a sharp solid-solution interface and the same crystal faceting observed at equilibrium and ignore any curvature effects on the surface tension for