fig1
From: Molecular simulation in surface hydration of clay minerals: a review of theory and applications
Figure 1. Crystal structure of (A) primitive cell of kaolinite; (B) supercell of 2 × 2 × 2; (C) Al-terminated surface ; (D) Si-terminated surface (O: red; H: white; Si: yellow; Al: purple). Reprinted from Ref.[69], copyright (2018), with permission from Elsevier.
