Online Encyclopedia

TRAPEZOHEDRAL

Online Encyclopedia
Originally appearing in Volume V07, Page 582 of the 1911 Encyclopedia Britannica.
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TRAPEZOHEDRAL CLASS (Trapezohedral-hemihedral). Six dyad axes of two kinds are perpendicular to the hexad axis. The general form jhikl} is the hexagonal trapezohedron bounded by twelve trapezoidal faces. The other simple forms are geometrically the same as in the holosymmetric class. Barium-anti monyldextro-tartrate+potassiumnitrate(Ba(SbO)2(C4H,06)2•KNO3) and the corresponding lead salt crystallize in this class.
End of Article: TRAPEZOHEDRAL
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