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DIHEXAGONAL PYRAMIDAL

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Originally appearing in Volume V07, Page 582 of the 1911 Encyclopedia Britannica.
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DIHEXAGONAL PYRAMIDAL CLASS (See also:

Hemimorphic-hemihedral). Six planes of symmetry of two kinds intersect in the hexad See also:axis. The hexad axis is uniterminal and all the forms are open forms. The See also:general See also:form (hikl} consists of twelve faces at oneend of the crystal, and is a dihexagonal See also: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 See also:holosymmetric class. Perpendicular to the hexad axis are the pedions (000i) and (000I). Iodyrite (Agl), See also:greenockite (CdS), wurtzite (ZnS) and See also:zincite (ZnO) are often placed in this class, but they more probably belong to the hemimorphic-hemihedral class of the See also:rhombohedral See also:division of this See also:system.

End of Article: DIHEXAGONAL PYRAMIDAL

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