Elementary Crystallography; Being Part One of General Mineralogy

Elementary Crystallography; Being Part One of General Mineralogy

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...X. The Monoclinic System. Symmetry of the Holohedrons of the Monoclinic System.--Complete forms belonging to the monoclinic system possess but a single plane of symmetry. Consequently monoclinic, holohedrons are bilaterally symmetrical; i.e., they possess two sides that are alike. They possess also an axis of binary symmetry perpendicular to the plane of symmetry and a center of symmetry (Fig. 182). Figure 183 is a diagrammatic representation of the distribution of the elements of symmetry in the plane of the lateral axes. Fig. 182.--Muriel of monoclinic crystal showing distribution of elements of symmetry in holohedrons. Fig 18,5.--Diagram illustrating distribution of symmetry elements of monoclinic holohedrons..--The single plane of symmetry in this system determines the position of one line which may be chosen as one of the axes of reference for the planes of monoclinic forms. This line is the axis of symmetry which is perpendicular to the plane of symmetry. The other two axes must necessarily lie in the plane of symmetry, but their directions in this plane are a matter of choice, to be decided in the case of each substance as may be most convenient. The two axes that lie in the plane of symmetry are at right angles to the third axis, but are inclined to each other at some angle other than 9o0. Their angle of inclination is always designated as the angle,9 (Fig. 184). Fig. 184.--Relation of axes to plane of symmetry in monoclinic holohedrons. Symmetry demands that the two terminations of the axis that is normal to the plane of symmetry shall be equivalent in all respects. There is, however, nothing in the symmetry of the system whifh necessitates the equivalency of any two of the three axes or of the opposite ends of the axes in the plane of...
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Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123663845X
  • 9781236638458