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BIPYRAMIDAL

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Originally appearing in Volume V07, Page 577 of the 1911 Encyclopedia Britannica.
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BIPYRAMIDAL CLASS (Parallel-faced hemihedral). The elements of symmetry are a tetrad See also:

axis with a See also:plane perpendicular to it, and a centre of symmetry. The See also:simple forms are the same here as in the See also:holosymmetric class, except the See also:prism {hko}, which has only four faces, and the bipyramid {hkll, which has eight faces and is distinguished as a " tetragonal See also:pyramid of the third See also:order." See also: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 See also:figs. 87 and 88. Examplesof substances which crystallize in thisclass are cassiterite, See also:rutile, See also:anatase, See also:zircon, See also:thorite, See also:vesuvianite, See also:apophyllite, See also:phosgenite, also See also:boron, See also:tin, mercuric iodide.

End of Article: BIPYRAMIDAL

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BIPYRAMIDAL CLASS (Parallel-faced aemihedral)

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