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Encyclopedia Britannica - Main :: DEM-DIO |
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DIHEXAGONAL PYRAMIDAL CLASS ( Hemimorphic
Six planes of symmetry of two kinds intersect in the hexad axis
axis
general form (hikl} consists of twelve faces at oneend of the crystal, and is a dihexagonal pyramid. The hexagonal pyramids {hoTtl} and (h.h.2L.l) each consist of six faces at one end of the crystal. The prisms are geometrically the same as in the holosymmetric class. Perpendicular to the hexad axis are the pedions (000i) and (000I).Iodyrite (Agl), greenockite
zincite
hemimorphic
rhombohedral
division of this system
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