tetragonal disphenoid honeycomb

This honeycomb's vertex figure is a tetrakis cube: 24 disphenoids meet at each vertex. The union of these 24 disphenoids forms a rhombic dodecahedron. Each edge of the tessellation is surrounded by either four or six disphenoids, according to whether it forms the base or one of the sides of its adjacent isosceles triangle faces respectively. When an edge forms the base of its adjacent isosceles triangles, and is surrounded by four disphenoids, they form an irregular octahedron. When an edge forms one of the two equal sides of its adjacent isosceles triangle faces, the six disphenoids surrounding the edge form a special type of parallelepiped called a trigonal trapezohedron.

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An orientation of the tetragonal disphenoid honeycomb can be obtained by starting with a cubic honeycomb, subdividing it at the planes $x=y$, $x=z$, and $y=z$ (i.e. subdividing each cube into path-tetrahedra), then squashing it along the main diagonal until the distance between the points (0, 0, 0) and (1, 1, 1) becomes the same as the distance between the points (0, 0, 0) and (0, 0, 1).

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The hexakis cubic honeycomb is a uniform space-filling tessellation (or honeycomb) in Euclidean 3-space. John Horton Conway calls it a pyramidille.

Cells can be seen in a translational cube, using 4 vertices on one face, and the cube center. Edges are colored by how many cells are around each of them.

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It can be seen as a cubic honeycomb with each cube subdivided by a center point into 6 square pyramid cells.

There are two types of planes of faces: one as a square tiling, and flattened triangular tiling with half of the triangles removed as holes.

It is dual to the truncated cubic honeycomb with octahedral and truncated cubic cells:

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If the square pyramids of the pyramidille are joined on their bases, another honeycomb is created with identical vertices and edges, called a square bipyramidal honeycomb, or the dual of the rectified cubic honeycomb.

It is analogous to the 2-dimensional tetrakis square tiling:

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The square bipyramidal honeycomb is a uniform space-filling tessellation (or honeycomb) in Euclidean 3-space. John Horton Conway calls it an oblate octahedrille or shortened to oboctahedrille.

A cell can be seen positioned within a translational cube, with 4 vertices mid-edge and 2 vertices in opposite faces. Edges are colored and labeled by the number of cells around the edge.

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It can be seen as a cubic honeycomb with each cube subdivided by a center point into 6 square pyramid cells. The original cubic honeycomb walls are removed, joining pairs of square pyramids into square bipyramids (octahedra). Its vertex and edge framework is identical to the hexakis cubic honeycomb.

There is one type of plane with faces: a flattened triangular tiling with half of the triangles as holes. These cut face-diagonally through the original cubes. There are also square tiling plane that exist as nonface holes passing through the centers of the octahedral cells.

It is dual to the rectified cubic honeycomb with octahedral and cuboctahedral cells:

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|bgcolor=#e7dcc3|Cell

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Phyllic disphenoid

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|bgcolor=#e7dcc3|Faces

|Rhombus
Triangle

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|bgcolor=#e7dcc3|Space group
Fibrifold notation
Coxeter notation||Cubic crystal system
8^o:2
4,3,4

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|bgcolor=#e7dcc3|Coxeter group||[4,3,4], $\{\backslash tilde\{C\}\}\_3$

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|bgcolor=#e7dcc3|vertex figures

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{{CDD|node_f1|3|node_f1|4|node_f1}}, {{CDD|node_f1|2x|node_f1|4|node_f1}}

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|bgcolor=#e7dcc3|Dual||Omnitruncated cubic honeycomb

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|bgcolor=#e7dcc3|Properties||Cell-transitive, face-transitive

|}

The phyllic disphenoidal honeycomb is a uniform space-filling tessellation (or honeycomb) in Euclidean 3-space. John Horton Conway calls this an Eighth pyramidille.

A cell can be seen as 1/48 of a translational cube with vertices positioned: one corner, one edge center, one face center, and the cube center. The edge colors and labels specify how many cells exist around the edge. It is one 1/6 of a smaller cube, with 6 phyllic disphenoidal cells sharing a common diagonal axis.

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It is dual to the omnitruncated cubic honeycomb:

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• Architectonic and catoptric tessellation
• Cubic honeycomb
• Space frame
• Tetrahedral-octahedral honeycomb
• Triakis truncated tetrahedral honeycomb

{{reflist}}

• {{citation

| last = Gibb | first = William

| title = Paper patterns: solid shapes from metric paper

| year = 1990

| journal = Mathematics in School

| volume = 19

| issue = 3

| pages = 2–4}}, reprinted in {{citation

| editor-last = Pritchard | editor-first = Chris

| year = 2003

| title = The Changing Shape of Geometry: Celebrating a Century of Geometry and Geometry Teaching

| publisher = Cambridge University Press

| isbn = 0-521-53162-4

| pages = 363–366}}.

• {{citation

| doi = 10.2307/2689983

| last = Senechal | first = Marjorie | authorlink = Marjorie Senechal

| title = Which tetrahedra fill space?

| year = 1981

| journal = Mathematics Magazine

| volume = 54

| issue = 5

| pages = 227–243

| publisher = Mathematical Association of America

| jstor = 2689983}}.

• {{cite book | last1 = Conway | first1 = John H. | authorlink1 = John Horton Conway | last2 = Burgiel | first2 = Heidi | last3 = Goodman-Strauss | first3 = Chaim | title = The Symmetries of Things | publisher = A K Peters, Ltd. | date = 2008 | chapter = 21. Naming Archimedean and Catalan Polyhedra and Tilings | pages = 292–298 | isbn = 978-1-56881-220-5}}

Category:3-honeycombs

Category:Tetrahedra