The combination of an icositetrahedron and an octahedron.

"...resembles in general appearance the regular icosahedron of geometry, but only eight f the faces…

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

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

Represents the combination of an octrahedron and a cube, with the cube faces predominate.

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

Represents the combination of a cube and an octahedron, with both faces being equal.

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

Illustration showing the combination of a octahedron and an dodecahedron.

"A combination of a trisoctahedron and an octahedron. It will be noted that the faces of the trisoctahedron…

Represents the combination of an octahedron and a cube, with the octahedron predominate.

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

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

"A contact twin, since the two individuals lie simply in contact with each other upon a certain plane."…

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

"A cube trunctuated with pyritohedron and octahedron." — Ford, 1912

"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…

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

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

"One allotropic forms of sulphur, that of a lemon-yellow brittle solid, crystallizing in orthorhombic…

"This solid is bounded by twenty-four isosceles triangles, and may be considered as an octahedron with…

An illustration showing "two octahedra...united by contact along a surface parallel to an octahedron…