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DITRIGONAL BIPYRAMIDAL

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Originally appearing in Volume V07, Page 582 of the 1911 Encyclopedia Britannica.
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DITRIGONAL See also:

BIPYRAMIDAL CLASS FIG. 76.—Crystal of a m a m 582 Hexagonal bipyramid of the second See also:order, bounded by twelve faces (s in See also:figs. 99 and 8o) ; indices {II2I} {See also:IO2} . . Dihexagonal See also:prism, consisting of twelve faces parallel to the hexad See also:axis and inclined to the See also:vertical planes of symmetry; indices {hiko}. Hexagonal prism of the first order limo), consisting of six faces parallel to the hexad axis and perpendicular to one set of three vertical planes of symmetry (m in figs. 71, 78-8o). Hexagonal prism of the second order {10o}, consisting of six faces also parallel to the hexad axis, but perpendicular to the other set of three vertical planes of symmetry (a in fig. 78). Basal pinacoid {000t}, consisting of a pair of parallel planes perpendicular to the hexad axis (c in figs. 71, 78-8o). See also:Beryl (See also:emerald), See also:connellite, See also:zinc, See also:magnesium and See also:beryllium crystallize in this class.

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