Alternated hexagonal tiling honeycomb
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In three-dimensional hyperbolic geometry, the alternated hexagonal tiling honeycomb, h{6,3,3}, 
or 
, is a semiregular tessellation with tetrahedron and triangular tiling cells arranged in an octahedron vertex figure. It is named after its construction, as an alternation of a hexagonal tiling honeycomb.
| Alternated hexagonal tiling honeycomb | |
|---|---|
| Type | Paracompact uniform honeycomb Semiregular honeycomb |
| Schläfli symbols | h{6,3,3} s{3,6,3} 2s{6,3,6} 2s{6,3[3]} s{3[3,3]} |
| Coxeter diagrams | ↔   ↔   ↔ ↔ |
| Cells | {3,3}  {3[3]}  |
| Faces | triangle {3} |
| Vertex figure |   truncated tetrahedron |
| Coxeter groups | , [3,3[3]] 1/2 , [6,3,3] 1/2 , [3,6,3] 1/2 , [6,3,6] 1/2 , [6,3[3]] 1/2 , [3[3,3]] |
| Properties | Vertex-transitive, edge-transitive, quasiregular |
A geometric honeycomb is a space-filling of polyhedral or higher-dimensional cells, so that there are no gaps. It is an example of the more general mathematical tiling or tessellation in any number of dimensions.
Honeycombs are usually constructed in ordinary Euclidean ("flat") space, like the convex uniform honeycombs. They may also be constructed in non-Euclidean spaces, such as hyperbolic uniform honeycombs. Any finite uniform polytope can be projected to its circumsphere to form a uniform honeycomb in spherical space.
Symmetry constructions
It has five alternated constructions from reflectional Coxeter groups all with four mirrors and only the first being regular: 
[6,3,3], [3,6,3], [6,3,6], 
[6,3[3]] and [3[3,3]] , having 1, 4, 6, 12 and 24 times larger fundamental domains respectively. In Coxeter notation subgroup markups, they are related as: [6,(3,3)*] (remove 3 mirrors, index 24 subgroup); [3,6,3*] or [3*,6,3] (remove 2 mirrors, index 6 subgroup); [1+,6,3,6,1+] (remove two orthogonal mirrors, index 4 subgroup); all of these are isomorphic to [3[3,3]]. The ringed Coxeter diagrams are , , , and , representing different types (colors) of hexagonal tilings in the Wythoff construction.
Related honeycombs
The alternated hexagonal tiling honeycomb has 3 related forms: the cantic hexagonal tiling honeycomb, ; the runcic hexagonal tiling honeycomb, ; and the runcicantic hexagonal tiling honeycomb, .
Cantic hexagonal tiling honeycomb
...| Cantic hexagonal tiling honeycomb | |
|---|---|
| Type | Paracompact uniform honeycomb |
| Schläfli symbols | h2{6,3,3} |
| Coxeter diagrams | ↔ |
| Cells | r{3,3}  t{3,3} h2{6,3}  |
| Faces | triangle {3} hexagon {6} |
| Vertex figure |  wedge |
| Coxeter groups | , [3,3[3]] |
| Properties | Vertex-transitive |
The cantic hexagonal tiling honeycomb, h2{6,3,3}, or , is composed of octahedron, truncated tetrahedron, and trihexagonal tiling facets, with a wedge vertex figure.
Runcic hexagonal tiling honeycomb
...| Runcic hexagonal tiling honeycomb | |
|---|---|
| Type | Paracompact uniform honeycomb |
| Schläfli symbols | h3{6,3,3} |
| Coxeter diagrams | ↔ |
| Cells | {3,3} {}x{3}  rr{3,3}  {3[3]} |
| Faces | triangle {3} square {4} hexagon {6} |
| Vertex figure |  triangular cupola |
| Coxeter groups | , [3,3[3]] |
| Properties | Vertex-transitive |
The runcic hexagonal tiling honeycomb, h3{6,3,3}, or , has tetrahedron, triangular prism, cuboctahedron, and triangular tiling facets, with a triangular cupola vertex figure.
Runcicantic hexagonal tiling honeycomb
...| Runcicantic hexagonal tiling honeycomb | |
|---|---|
| Type | Paracompact uniform honeycomb |
| Schläfli symbols | h2,3{6,3,3} |
| Coxeter diagrams | ↔ |
| Cells | t{3,3} {}x{3} tr{3,3}  h2{6,3} |
| Faces | triangle {3} square {4} hexagon {6} |
| Vertex figure |  rectangular pyramid |
| Coxeter groups | , [3,3[3]] |
| Properties | Vertex-transitive |
The runcicantic hexagonal tiling honeycomb, h2,3{6,3,3}, or , has truncated tetrahedron, triangular prism, truncated octahedron, and trihexagonal tiling facets, with a rectangular pyramid vertex figure.