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PYRAMIDAL CLASS (Hemimorphic-tetartoh...

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Originally appearing in Volume V07, Page 577 of the 1911 Encyclopedia Britannica.
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PYRAMIDAL CLASS (See also:

Hemimorphic-See also:tetartohedral) . Here the only See also:element of symmetry is the tetrad See also:axis. The pyramids of the first lhhll second {hol} and third{hkl} orders have each only four faces at one or other end of the crystal, and are hemimorphic. All the See also:simple forms are thus open forms. Examples are See also:wulfenite (PbMoO4) and See also:barium antimonyl dextrotartrate (Ba(SbO)2(C4H40o).H20).

End of Article: PYRAMIDAL CLASS (Hemimorphic-tetartohedral)

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