principal axes, eight trigonal, and twelve rhombic, or tetragonal with unequal angles.
7.
The hexakisoctahedrons (fig. 7), bounded by forty-eight scalene
triangles, vary much in general aspect, approaching more or less to
all the preceding forms ; but most frequently they have the face?
arranged either in six groups of eight, or eight of six, or twelve of
four faces. There are twenty-four long edges, often corresponding to
those of the rhombic-dodecahedron ; twenty-four intermediate edges
lying in pairs over each edge of the inscribed octahedron ; and
twenty-four short edges in pairs over the edges of the inscribed cube.
There are six ditetragonal angles joined by the principal axes, eight
hexagonal and twelve rhombic angles.—Ex., fluor spar, garnet, diamond.
