See what you will probably never see in reality, thanks to the PCOD

Three-dimensional V₂O₅ models (not DFT-optimized) as predicted by GRINSP

Construction of these V₂O₅ models (3D, 2D, and 1D) described in 2005 and 2010 in refs. [1 and 8] - VO₅ square pyramids or/and trigonal bipyramids interconnected exclusively by corner-sharing. Data from the 2009 (1319 models) PCOD updates.

Ordered by increasing FD (Framework Density) : largest tunnels and biggest cavities first.

Not exhaustive list (more will be added during the next weeks, maybe, and also, more can be obtained by running again GRINSP)...

References for these GRINSP predictions :

1- Inorganic structure prediction with GRINSP. A. Le Bail, J. Appl. Cryst. 38 (2005) 389-395. http://journals.iucr.org/j/issues/2005/02/00/cg5019/
2- Predicted corner-sharing titanium silicates. A. Le Bail, Z. Kristallogr., Suppl. 26 (2007) 203-208. https://www.researchgate.net/publication/228093494_Predicted_corner-sharing_titanium_silicates
3- Powerpoint file : Contribution to the "Gordon Conference Style" Workshop : Global Optimisation Techniques Applied to the Prediction of Structures, 5-7 July 2006, University College London (.ppt or zipped)
4- Advances in structure prediction of inorganic compounds. A. Le Bail, Report of 2nd Algerian Crystallography Congress, Algérie (2005). http://arxiv.org/abs/cond-mat/0606025
5- Hypothetical AlF₃ crystal structures, A. Le Bail, F. Calvayrac, J. Solid State Chem., 179 (2006) 3159-3166.
6- Inorganic structure prediction: too much and not enough, A. Le Bail, Solid State Phenomena 130 (2007) 1-6.
7- Frontiers between crystal structure prediction and determination by powder diffractometry, A. Le Bail, Powder Diffraction, S23 (2008) S5-S12.
8- Databases of virtual inorganic crystal structures and their applications, A. Le Bail, Phys. Chem. Chem. Phys. 12 (2010) 8521-8530. DOI: 10.1039/c003907c

Etc - search by yourself after all...