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![[Figure 1]](br1343fig1mag.jpg)
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Figure 1
Polyhedral representations of tridymite at various temperatures, viewed along the c axis. (a) Hexagonal AlPO4 tridymite at 593 K, (b) monoclinic AlPO4 tridymite at 473 K and (c) orthorhombic SiO2 tridymite at 573 K (after Kihara et al., 1986  ). Key: shaded tetrahedra, AlO4; white, PO4; gray, SiO4. The shapes of the unit cells are shown by dotted lines. The small arrows indicate the direction of the shift of the layers of tetrahedra in (b) and (c). |
![[Figure 1]](br1343fig1.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
