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DITETRAGONAL PYRAMIDAL

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Originally appearing in Volume V07, Page 577 of the 1911 Encyclopedia Britannica.

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DITETRAGONAL PYRAMIDAL CLASS (See also:

HEMIMORPHIC

Hemimorphic-hemihedral) . Here there are two pairs of See also:

VERTICAL (from Lat. vertex, highest point)

vertical planes of symmetry intersecting in the tetrad See also:

AXIS (Lat. for " axle ")

axis . The pyramids {hhll and lhol} and the bipyramid {hkl} are all hemimorphic . Examples are iodosuccimide (C 4H 402N I) , See also:

SILVER

silver fluoride (AgF .H20) , and penta-See also:

ERYTHRITE

erythrite (C&H12O4) . No examples are known amongst minerals .

End of Article: DITETRAGONAL PYRAMIDAL

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