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BIPYRAMIDAL CLASS (Parallel-faced aem...

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Originally appearing in Volume V07, Page 582 of the 1911 Encyclopedia Britannica.
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BIPYRAMIDAL CLASS (Parallel-faced aemihedral) . Here there is a See also:plane of .symmetry perpendicular to the hexad See also:axis; there is also a centre of symmetry. All the closed forms are hexagonal bipyramids; the open forms are hexagonal prisms or the basal pinacoid. The See also:general See also:form Ihikl} is hemihedral with parallel faces with respect to the general form of the See also:holosymmetric class. See also:Apatite (q.v.), See also:pyromorphite, See also:mimetite and See also:vanadinite possess this degree of symmetry.

End of Article: BIPYRAMIDAL CLASS (Parallel-faced aemihedral)

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