A Tract on Crystallography: Designed for the Use of Students in the University

Deighton, Bell and Company, 1863 - 86 Seiten

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Seite 72 - ... and therefore if, from a single * "A twin-crystal is composed of two crystals joined together in such a manner " that one would come into the position of the other by revolving through two right " angles round an axis which is perpendicular to a plane which either is, or may be, " a face of either crystal. The axis will be called the twin-axis, and the plane to " which it is perpendicular the twin-plane." Miller's Treatiie on Crystallography, p. 103. In the text the word

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