octahedron's Usage Examples:

The crystals are sometimes polysynthetic, a large octahedron, e.g., being built up of small cubes.

Diamond may break with a conchoidal fracture, but the crystals always cleave readily along planes parallel to the octahedron faces: of this property the diamond cutters avail themselves when reducing the stone to the most convenient form for cutting; a sawing process, has, however, now been introduced, which is preferable to that of cleavage.

Marsh also devised a form closely resembling that of Thomsen, inasmuch as the carbon atoms occupied the angles of a regular octahedron, and the diagonal linkages differed in nature from the peripheral, but differeng from Thomsen's since rupture of the diagonal and not peripheral bonds accompanied the reduction to hexamethylene.

Two such sets placed base to base form the octahedron, which consequently has 8 faces, 6 vertices and 12 edges.

Ladenburg's prism formula would give two enantiomorphic ortho-di-substitution derivatives; while forms in which the hydrogen atoms are placed at the corners of a regular octahedron would yield enantiomorphic tri-substitution derivatives.

The regular octahedron has for its faces equilateral triangles; it is the reciprocal of the cube.

There is often a furrow running along the edges of the octahedron, or across the edges of the cube, and this indicates that the apparently simple crystal may really consist of eight individuals meeting at the centre; or, what comes to the same thing, of two individuals interpenetrating and projecting through each other.

1 shows P the cube {100}, d the octahedron {III }, and e the pentagonal dodecahedron {210}.

the cube, the octahedron, and the pentagonal dodecahedron.

A yellowish octahedron found at De Beers weighed 4282 carats, and yielded a brilliant of 2882 carats.

Synonyms:

polyhedron,