Twinning axis

See the Note under Twin, n.

See also: Twinning

References in periodicals archive ?
This can be done for the various isometric forms by the following sequence of operations: (a) choose a Ft [l11] twinning axis on a crystal model or drawing; (b) identify faces which may make up a belly band on twinning; (c) show that the Miller Indicesa of a chosen face apparently parallel to the twin axis do indeed satisfy the zonal equation as before; and (d) show that an adjacent face with a similar orientation is 60[degrees] from the first face.