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Encyclopedia Britannica - Main :: HIG-HOR |
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HOLOSYMMETRIC CLASS ( Holohedral
bipyramidal
Intersecting in the hexad axis
axis
vertical plane of symmetry. The seven simple forms are:Dihexagonal bipyramid, bounded by twenty-four scalene triangles (fig. 77; v in fig. 8o). The indices are {2131}, &c., or in general {hikl}. This form may be considered as a combination
direct
Hexagonal bipyramid of the first order, bounded by twelve isosceles triangles (fig. 70; p and u in fig. 8o); indices 110111, (202I} . . . (holll). The hexagonal bipyramid so common in quartz
combination
direct
size
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