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Encyclopedia Britannica



DITRIGONAL PYRAMIDAL

This article appears in Volume V07, Page 581 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: DIO-DRO
DITRIGONAL PYRAMIDAL CLASS
(
Hemimorphic
 -hemihedral).
Here there are three similar planes of symmetry intersecting in the triad
axis
 ; there are no dyad axes and no centre of symmetry. The triad
axis
  is uniterminal and polar, and the crystals are differently
developed
  at the two ends; crystals of this class are therefore pyro-electric. The forms are all open forms:
Trigonal pyramid lhkk}, consisting of three faces which correspond to the three upper or the three
lower
  faces of a rhombohedron of the holosymmetric class.
Ditrigonal pyramid {hkl}, of six faces, corresponding to the six upper or
lower
  faces of, the scalenohedron.
Hexagonal pyramid (hkl) (where h-2k+ l=o), of six faces, corresponding to the six upper or lower faces of the hexagonal bipyramid.
Trigonal prism {211} or {III}, two forms each consisting of three faces parallel to
principal
  axis and perpendicular to the planes of symmetry.
Hexagonal prism 1.1011, which is geo-FIG. 73.Crystal of metrically the same as m the last class.
Tourmaline. Ditrigonal prism {hkl) (where h+k+l=o),
of six faces parallel to the
principal
  axis, and with two sets of angles between them.
Basal pedion (III) or (TM, each consisting of a single plane perpendicular to the principal axis.
Fig. 73 represents a crystal of tourmaline with the trigonal prism (2YY), hexagonal prism (IOY), and a trigonal pyramid at each end. Other substances crystallizing in, this class are
pyrargyrite
 ,
proustite
 , iodyrite (AgI), greenockite,
zincite
 , spangolite,
sodium
  lithium sulphate, tolylphenylketone.


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