Represents a combination of a pentagonal dodecahedron and cube, and are common in pyrites.

Combination of Pentagonal Dodecahedron and Cube

Represents a combination of a pentagonal dodecahedron and cube, and are common in pyrites.

Represents the combination of pentagonal dodecahedron, cube, and octahedron.

Combination of Pentagonal Dodecahedron, Cube and Octahedron

Represents the combination of pentagonal dodecahedron, cube, and octahedron.

Represents the combination of pentagonal dodcahedron, dyakis-dodecahedron and octahedron.

Combination of Pentagonal Dodecahedron, Dyakis-dodecahedron, and Octahedron

Represents the combination of pentagonal dodcahedron, dyakis-dodecahedron and octahedron.

"...shows the rhombic dodecahedron in combination with the octahedron." -The Encyclopedia Britannica 1910

Combination of Rhombic Dodecahedron and Octahedron

"...shows the rhombic dodecahedron in combination with the octahedron." -The Encyclopedia Britannica…

A combination of a tetrahedron and a rhombic dodecahedron.

Combination of Tetrahedron and Rhombic Dodecahedron

A combination of a tetrahedron and a rhombic dodecahedron.

"A combination of dodecahedron and cube." — Ford, 1912

Cube and dodecahedron

"A combination of dodecahedron and cube." — Ford, 1912

"A combination of cube, dodecahedron, and tetrahedron." — Ford, 1912

Cube, dodecahedron and tetrahedron

"A combination of cube, dodecahedron, and tetrahedron." — Ford, 1912

A cube, octahedron, and dodecahedron.

Cube, octahedron and dodecahedron

A cube, octahedron, and dodecahedron.

"This is the hemihedral form of the triakis-octahedron; it has the indices {hhk} and is bounded by tweleve trapazoidal faces." -The Encyclopedia Britannica 1910

Deltoid Dodecahedron

"This is the hemihedral form of the triakis-octahedron; it has the indices {hhk} and is bounded by tweleve…

Dodecahedron.

Dodecahedron

Dodecahedron.

Principal forms of the isometric system: dodecahedron.

Dodecahedron

Principal forms of the isometric system: dodecahedron.

"A combination of dodecahedron and hexoctahedron." — Ford, 1912

Dodecahedron and hexoctahedron

"A combination of dodecahedron and hexoctahedron." — Ford, 1912

A dodecahedron and octahedron

Dodecahedron and octahedron

A dodecahedron and octahedron

A dodecahedron and trapezohedron.

Dodecahedron and trapezohedron

A dodecahedron and trapezohedron.

A dodecahedron and trapezohedron

Dodecahedron and trapezohedron

A dodecahedron and trapezohedron

"The faces of the deltoid dodecahedron correspond to one-half those of the trisoctahedron." — Ford, 1912

Deltoid dodecahedron

"The faces of the deltoid dodecahedron correspond to one-half those of the trisoctahedron." —…

A distorted dodecahedron

Distorted dodecahedron

A distorted dodecahedron

A regular solid each face of which has the same boundaries as five covertical faces of an ordinary icosahedron.

Great Dodecahedron

A regular solid each face of which has the same boundaries as five covertical faces of an ordinary icosahedron.

Pattern that can be cut out and folded to construct a regular dodecahedron. Fold on the dotted lines, and keep the edges in contact by the glued strips of paper.

Pattern for Dodecahedron

Pattern that can be cut out and folded to construct a regular dodecahedron. Fold on the dotted lines,…

A solid consisting of similiar faces, each of which is a pentagon.

Pentagonal Dodecahedron

A solid consisting of similiar faces, each of which is a pentagon.

Illustration showing a pentagonal dodecahedron.

Pentagonal Dodecahedron

Illustration showing a pentagonal dodecahedron.

A solid consisting of 12 similiar faces, each of which is rhomb, the angle between any two adjacent face being 120 degrees.

Rhombic Dodecahedron

A solid consisting of 12 similiar faces, each of which is rhomb, the angle between any two adjacent…

A regular solid each face of which formed by stellating a face of the dodecahedron.

Stellated Dodecahedron

A regular solid each face of which formed by stellating a face of the dodecahedron.

"A combination of of dodecahedron, trapezohedron, and hexoctahedron." — Ford, 1912

Dodecahedron, trapezohedron and hexoctahedron

"A combination of of dodecahedron, trapezohedron, and hexoctahedron." — Ford, 1912

Illustration showing a trigonal dodecahedron.

Trigonal Dodecahedron

Illustration showing a trigonal dodecahedron.

A regular dyocaetriacontahedron formed by cutting off the faces of a regular dodecahedron parallel to those of the coxial icosahedron so as to leave the former decagons.

Truncated Dodecahedron

A regular dyocaetriacontahedron formed by cutting off the faces of a regular dodecahedron parallel to…

"This is the hemihedral form of the hexakis-octahedron and has the indicies {hkl}; it is bounded by twenty-four faces." -The Encyclopedia Britannica 1910

Dyakis-dodecahedron

"This is the hemihedral form of the hexakis-octahedron and has the indicies {hkl}; it is bounded by…

Illustration showing a dyakisdodecahedron or diploid.

Dyakisdodecahedron

Illustration showing a dyakisdodecahedron or diploid.

Illustration showing the combination of a hexahedron and an dodecahedron.

Hexahedron and Dodecahedron

Illustration showing the combination of a hexahedron and an dodecahedron.

A combination of octahedron and dodecahedron.

Octahedron and dodecahedron

A combination of octahedron and dodecahedron.

Illustration showing the combination of a octahedron and an dodecahedron.

Octahedron and Dodecahedron

Illustration showing the combination of a octahedron and an dodecahedron.

"This is bounded by twelve pentagonal faces, but these are not regular pentagons, and the angles over the three sets of different edges are different. The regular dodecahedron of geometry, contained by twelve regular pentagons, is not a possible form in crystals." -The Encyclopedia Britannica 1910

Pentagonal Dodecahedron

"This is bounded by twelve pentagonal faces, but these are not regular pentagons, and the angles over…

"At the freezing point [phosphorus] hardens, becomes brittle, and shows, on being broken, evidences of crystalline structure, the crystals being dodecahedral." —Hallock 1905

Phosphorus

"At the freezing point [phosphorus] hardens, becomes brittle, and shows, on being broken, evidences…

Illustration of regular polyhedrons: tetrahedron, hexahedron, octahedron, dodecahedron, icosahedron.

Regular Polyhedrons

Illustration of regular polyhedrons: tetrahedron, hexahedron, octahedron, dodecahedron, icosahedron.

A pentagonal dodecahedron. A solid contained by twelve pentagons.

Pyritohedron

A pentagonal dodecahedron. A solid contained by twelve pentagons.

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which belongs a number of forms having some property in common. In order to classify these different crystals, the existence of certain lines within the crystal, called axes, is assumed, around which the form can be symmetrically build up. These axes are assumed to intersect in the center of the crystal, and to pass through from one side to the other." — Hallock, 1905

Rhombic Dodecahedron

"Science has succeeded in classifying the thousands of known crystals in six systems, to each of which…

A geometric shape containing twelve faces.

Rhombic Dodecahedron

A geometric shape containing twelve faces.

"Bounded by twelve rhomb-shaped faces parallel to the six dodecahedral planes of symetry. the angles between the normals to adjacent faces are 60 degrees...[and] 90 degrees; the indices are {110}" -The Encyclopedia Britannica 1910

Rhombic Dodecahedron

"Bounded by twelve rhomb-shaped faces parallel to the six dodecahedral planes of symetry. the angles…

Illustration containing a tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron, placed next to each other.

Various Solid Forms

Illustration containing a tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron, placed…

A solid formed my stellating each face of the ordinary dodecahedron.

Small Stellated Dodecahedron

A solid formed my stellating each face of the ordinary dodecahedron.

"This is bounded by twelve irregular pentagons, and is a tetartohedral or quarter-faced for of the hexakis-octahedron." -The Encyclopedia Britannica 1910

Tetrahedral Pentagonal Dodecahedron

"This is bounded by twelve irregular pentagons, and is a tetartohedral or quarter-faced for of the hexakis-octahedron."…

"The combination of tetrahedron and dodecahedron." — Ford, 1912

Tetrahedron and dodecahedron

"The combination of tetrahedron and dodecahedron." — Ford, 1912