Elementary Crystallography Being Part One of General Mineralogy
Elementary Crystallography Being Part One of General Mineralogy
William Shirley Bayley
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84) forms. Their indices are *(hikl) and *(ihkl). The Rhombohedrons. By suppressing every alternate plane composing the pyramid of the first order and extending the remaining planes two new congruent forms are produced, each bounded by six similar rhombs. These possess two kinds of solid 72 GEOMETRICAL CRYSTALLOGRAPHY angles, of which two are polar and four lateral. The polar angles are larger or smaller than the other four depending upon the value of the intercepts on c. When the axial ratio i...s i : \/i-5 FIG. 83. ? o s i - FIG. 84. Nega- tive hexagonal sea- t i v e hexagonal lenohedron, + E scalenohedron, or *(*/). -*f" or *(*/). or i : 1. 22474, the polar and lateral angles on the unity rhom- /p\ bohedron ( - ) are equal. The new forms are called the posi- \2 / tive (Fig. 85) and the negative (Fig. 86) rhombohedron FIG. 85. Positive FIG. 86. Negative rhombohedron, + ' rhombohedron. M ^' 2 a or + R, or K(hohl). Or R, or K(ohtil"). the latter being the one that turns an upper edge toward the observer.
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