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Encyclopedia Britannica



BIPYRAMIDAL

This article appears in Volume V07, Page 577 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BER-BLA
BIPYRAMIDAL CLASS
(Parallel-faced hemihedral).
The elements of symmetry are a tetrad
axis
  with a plane perpendicular to it, and a centre of symmetry. The
simple
  forms are the same here as in the holosymmetric class, except the prism {hko}, which has only four faces, and the bipyramid {hkll, which has eight faces and is distinguished as a " tetragonal pyramid of the third
order
 ."
Combination
  of Tetragonal Prism and Basal Pinacoid.
combination
  of a bipyramid of the first
order
  with a ditetragonal bipyramid and the prism of the second order. Compare also
figs
 . 87 and 88.
Examplesof substances which crystallize in thisclass are cassiterite,
rutile
 , anatase, zircon, thorite, vesuvianite, apophyllite, phosgenite, also
boron
 , tin, mercuric iodide.


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