"...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

The illustration "shows how the octahedron with furrowed edge may be constructed from two interpenetrating tetrahedra (shown in dotted lines)." -Britannica, 1910

Octahedron with Furrow Edge

The illustration "shows how the octahedron with furrowed edge may be constructed from two interpenetrating…

An illustration showing "two octahedra...united by contact along a surface parallel to an octahedron face without interpentration. " -Britannica, 1910

Two Octahedra

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