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HOLOSYMMETRIC

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Originally appearing in Volume V07, Page 581 of the 1911 Encyclopedia Britannica.
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HOLOSYMMETRIC CLASS (See also:

Holohedral; Dihexagonal See also:bipyramidal). Intersecting in the hexad See also:axis are six planes of symmetry of two kinds, and perpendicular to them is an See also:equatorial See also:plane of symmetry. Perpendicular to the hexad axis are six dyad axes of two kinds and each perpendicular to a See also:vertical plane of symmetry. The seven See also:simple forms are: Dihexagonal bipyramid, bounded by twenty-four scalene triangles (fig. 77; v in fig. 8o). The indices are {2131}, &c., or in See also:general {hikl}. This See also:form may be considered as a See also:combination of two scalenohedra, a See also:direct and an inverse. Hexagonal bipyramid of the first See also:order, bounded by twelve isosceles triangles (fig. 70; p and u in fig. 8o); indices 110111, (202I} . . .

(holll). The hexagonal bipyramid so See also:

common in See also:quartz is geometrically similar to this form, but it really is a combination of two rhombohedra, a direct and an inverse, the faces of whit.h differ in See also:surface characters and often also in See also:size.

End of Article: HOLOSYMMETRIC

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HOLOSYMMETRIC CLASS (Holohedral (ass, whole)

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