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Encyclopedia Britannica



DITRIGONAL BIPYRAMIDAL

This article appears in Volume V07, Page 582 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: DIO-DRO
DITRIGONAL BIPYRAMIDAL CLASS FIG. 76.Crystal of
a
m
a
m
582
Hexagonal bipyramid of the second
order
 , bounded by twelve faces (s in
figs
 . 99 and 8o) ; indices {II2I} {IO2} . .
Dihexagonal prism, consisting of twelve faces parallel to the hexad
axis
  and inclined to the
vertical
  planes of symmetry; indices {hiko}.
Hexagonal prism of the first
order
  limo), consisting of six faces parallel to the hexad
axis
  and perpendicular to one set of three
vertical
  planes of symmetry (m in
figs
 . 71, 78-8o).
Hexagonal prism of the second order {10o}, consisting of six faces also parallel to the hexad axis, but perpendicular to the other set of three vertical planes of symmetry (a in fig. 78).
Basal pinacoid {000t}, consisting of a pair of parallel planes perpendicular to the hexad axis (c in figs. 71, 78-8o).
Beryl
  (
emerald
 ),
connellite
 ,
zinc
 , magnesium and
beryllium
  crystallize in this class.


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