Page:EB1922 - Volume 30.djvu/823

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CRYSTALLOGRAPHY

Fig. 1. Simple Cubic Space-Lattice.


Fig. 2. Arrangement of Points on the Surface of a Cubic Crystal. (Simple cubic lattice.)


Fig. 3. Vertical Sections Through the Structure (fig.j), showing:-

(a) Distance between cube planes.

(b) Distance between rhombic dodecahedron planes.

(c) Distance between octahedron planes.


Fig. 4. (a) Simple Cubic Lattice.

(b) Centred Cubic Lattice.

(c) Face-centred Cubic Lattice.


Fig. 5. Laue X-ray Photograph Through the Basal Plane of Penninite.


Fig. 8. Stereogram of Laue Photograph of Anhydrite on the Face (010).


Fig. 6. Reflection of X Rays by Planes of Particles.


Fig. 7. Reflection of X Rays by Planes of Particles: production of spots in the Laue photographs.


Fig. 9. Structure of Rock-salt (sodium and chlorine atoms in simple cubic space-lattice): or of Galena (PbS).

Fig. 10. “Diamond Lattice” representing Diamond when the atoms are all of the same kind, or Zinc-blende when of two kinds.