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CRYSTALLOGRAPHY

FlG. I. 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 (oio).


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.


Kic. g. Structure of Rock- salt (sodium and chlorine atoms i n simple cubic space- lattice) : or of Galena (PbS>.

FIG. 10. "Diamond Lat- tice "representing Diamond when the atoms are all of the same kind, or Zinc-blende when of two kinds.