** Next:** 4.4 Zone axis of two sets
**Up:** 4. Crystallographic Calculations Using the Reciprocal
** Previous:** 4.2 Vector product of two direct

The vector product of two vectors **n**_{1} and **n**_{2} respectively
parallel to these two rows is normal to the set of lattice planes and is
therefore parallel to the reciprocal lattice vector associated with the lattice
planes. If *h, k, l* are its indices, we may therefore write:

(4.2) |

**Copyright © 1981, 1998 International Union of
Crystallography**