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"...consisting of six rhomb-shaped faces with the edges all of the equal lengths: the faces are perpendicular to the planes of symmetry." -The Encyclopedia Britannica 1910

Direct Rhombohedra

"...consisting of six rhomb-shaped faces with the edges all of the equal lengths: the faces are perpendicular…

"...consisting of six rhomb-shaped faces with the edges all of the equal lengths: the faces are perpendicular to the planes of symmetry." -The Encyclopedia Britannica 1910

Indirect Rhombohedra

"...consisting of six rhomb-shaped faces with the edges all of the equal lengths: the faces are perpendicular…