ClipArt illustrations of octahedrons. Octahedrons are polyhedrons (3-dimensional solids with polygons as faces) with eight faces.

"When a corner or an edge of one form is replaced by a face of another form, the first is said to be trunctuated by the second." — Ford, 1912

Octahedron trunctuated by cube

"When a corner or an edge of one form is replaced by a face of another form, the first is said to be…

"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

First Right Square Octahedron

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

"...is elongated in the direction of one of the edges of the octahedron..." -The Encyclopedia Britannica 1910

Misshapen Octahedra

"...is elongated in the direction of one of the edges of the octahedron..." -The Encyclopedia Britannica…

"...is flattened parallel to one pair of faces [of the octahedron]." -The Encyclopedia Britannica 1910

Misshapen Octahedra

"...is flattened parallel to one pair of faces [of the octahedron]." -The Encyclopedia Britannica 1910

An octohedron.

Octahedron

An octohedron.

A polyhedron with eight faces.

Octahedron

A polyhedron with eight faces.

"Right octahedron with rhombic base." — Hallock, 1905

Octahedron

"Right octahedron with rhombic base." — Hallock, 1905

"Right octahedron with rhombic base." — Hallock, 1905

Octahedron

"Right octahedron with rhombic base." — Hallock, 1905

"Oblique rhombic octahedron." — Hallock, 1905

Octahedron

"Oblique rhombic octahedron." — Hallock, 1905

An octahedron, or double four-sided pyramid. It has 8 sides.

Octahedron

An octahedron, or double four-sided pyramid. It has 8 sides.

An octohedron.

Octahedron

An octohedron.

Illustration showing a perfect octahedron.

Octahedron

Illustration showing a perfect octahedron.

Illustration showing a flattened octahedron.

Octahedron

Illustration showing a flattened octahedron.

Principal forms of the isometric system: octahedron.

Octahedron

Principal forms of the isometric system: octahedron.

A distorted octahedron.

Distorted octahedron

A distorted octahedron.

Illustration of a regular octahedron. A polyhedron with eight equal faces.

Regular Octahedron

Illustration of a regular octahedron. A polyhedron with eight equal faces.

"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

Regular Octahedron

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

"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

Second Right Square Octahedron

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

"An octahedron twinned on an octahedral face has the two portions symmetrical with repsect to a plane parallel to this face (the large triangular face in this figure)." -The Encyclopedia Britannica 1910

Spinel-twin

"An octahedron twinned on an octahedral face has the two portions symmetrical with repsect to a plane…