It is a layered silicate mineral, with one tetrahedral sheet linked through oxygen atoms to one octahedral sheet of alumina octahedra.
At each linked edge two oxygen ions are shared between two octahedra, and each octahedron must have two shared edges to form a chain.
As a result, the triangular prisms expand into hexagonal prisms, and the truncated tetrahedra expand into truncated octahedra.
The cells are 5 cuboctahedra, 5 octahedra, and 10 triangular prisms.
Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedra.
Each vertex is surrounded by four cells: two truncated octahedra, and two hexagonal prisms, arranged in two chiral irregular tetrahedral vertex figures.
It is composed of truncated cubes and octahedra in a ratio of 1:1.
Unfortunately, we now need to pack cycles into these modified octahedra, and for very short cycles we shall need to introduce several alternative modifications to the octahedra.
