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Encyclopedia Britannica - Main :: DIO-DRO |
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DITRIGONAL BIPYRAMIDAL CLASS FIG. 76.Crystal of a m a m 582 Hexagonal bipyramid of the second order
figs
Dihexagonal prism, consisting of twelve faces parallel to the hexad axis
vertical planes of symmetry; indices {hiko}.Hexagonal prism of the first order
axis
vertical planes of symmetry (m in figs
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). Beryl
emerald
connellite
zinc
beryllium
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