Online Encyclopedia

DITETRAGONAL PYRAMIDAL

Online Encyclopedia
Originally appearing in Volume V07, Page 577 of the 1911 Encyclopedia Britannica.
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DITETRAGONAL PYRAMIDAL CLASS (Hemimorphic-hemihedral). Here there are two pairs of vertical planes of symmetry intersecting in the tetrad axis. The pyramids {hhll and lhol} and the bipyramid {hkl} are all hemimorphic. Examples are iodosuccimide (C 4H 402N I) , silver fluoride (AgF .H20) , and penta-erythrite (C&H12O4). No examples are known amongst minerals.
End of Article: DITETRAGONAL PYRAMIDAL
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DISTYLE (from Gr. &-, two, and rrOXos, column)
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