Zonal equation

(Crystallog.) the mathematical relation which belongs to all the planes of a zone, and expresses their common position with reference to the axes.

See also: Zonal

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Actually, it can be shown algebraically that any form which satisfies the zonal equation will also satisfy the interfacial angle equals 60[degrees] requirement, thus making step (d) superfluous.
The cube {100}, octahedron {111}, all trisoctahedra {hhl}, and all tetrahexahedra {hk0} do not yield belly bands since they cannot satisfy the zonal equation. As shown earlier, the dodecahedron {110} has a belly band of six faces.
For the general case of hexoctahedra {hkl} satisfying the zonal equation h = k + 1, the Miller Indices of the corresponding dihexagonal prism are (2l + k k-l 2k + l0}.