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By Walter Borchardt-Ott (auth.)

As a self-study consultant, path primer or instructing reduction, Borchardt-Ott's Crystallography is the fitting textbook for college students and lecturers alike. in truth, it may be utilized by crystallographers, chemists, mineralogists, geologists and physicists. in response to the author's greater than 25 years of educating adventure, the publication has quite a few line drawings designed specifically for the textual content and loads of workouts - with ideas - on the finish of every bankruptcy. This third version is the interpretation of the 7th German variation with new chapters fascinated about crystal chemistry and x-ray diffraction methods.

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These habits are illustrated in Fig. 2 by the relative sizes of the hexagonal prism and the pinacoid. (c) Zone. The crystals in Figs. 4 show several examples of three or more crystal faces intersecting one another to form parallel edges. A set of crystal faces whose lines of intersection are parallel is called a zone (Fig. 3). Faces belonging to the same zone are called tautozonal. The direction parallel to the lines of intersection is the zone axis. Starting from any point inside the crystal, the normals to all the faces in a zone are coplanar, and the zone axis is normal to this plane.

28 the complication rule, it is now possible to index the following faces and their equivalents: (101) = (100) + (001) = (111) + (111), (011) = (010) + (001) = (111) + (111), (110) = (100) + (010) = (111) + (111). The remaining faces are then: 5 : (111) + (001) = (101) + (011) = (112) 3 : (010) + (011) = (111) + (110) = (021) 4 : (110) + (010) = (111) − (011) = (120) The crystal is now fully indexed, and is, in fact, the topaz crystal shown in Fig. 28. 49 50 5 Morphology Fig. 32 The all-positive octant of the topaz stereogram from Fig.

1 shows the crystal structure and the morphology of the mineral galena (PbS). The faces of a crystal are parallel to sets of lattice planes occupied by atoms, while the edges are parallel to lattice lines occupied by atoms. In Fig. 1a, these atoms are represented by points. A lattice plane occupied by atoms is not actually flat. This may be seen for the lattice plane (100), (010) or (001) in Fig. 1c when the size of the spherical atoms is taken into account, and is even more marked for crystals of molecular compounds.

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