fig2
![A versatile messenger for chirality communication: asymmetric silica framework](https://image.oaes.cc/6da874ed-df0d-4dd2-a9fe-45f530c56710/4451.fig.2.jpg)
Figure 2. (A) Basic SiO4 tetrahedra in SiO2 framework [angles (α, φ) and bond lengths d are variable]. (B) Crystal structures of L- and R-quartz. This figure is used with permission from the American Physical Society[24]. (C) Schematic models of a pair of AB4 tetrahedral enantiomers with clockwise or counter-clockwise patterns.