Polyhedral models
![[filling space with 3-fold base symmetry]](https://www.iucr.org/__data/assets/image/0012/3117/3fold.png)
Several resources allowing you to construct polyhedral models are available from the Fortran Friends web site. By courtesy of Fortran Friends, we are also making available from the IUCr site the models and instructions for their use that are of greatest relevance to those interested in crystallography. They may be freely copied for educational purposes.