The view is perpendicular to that shown in Fig. 1, with the central crystallographic 2-fold axis in the plane of the paper.

Close-up of the molecular association at the crystallographic 2-fold axis.

Under these conditions, the scattered flux is minimal along the crystallographic axes.

These azimuthal patterns allow the immediate identification of the surface periodicity, or main crystallographic axes.

Monoclinic minerals have three crystallographic axes of unequal length.

The specific characteristics will depend on the mode of vibration and the angle at which the quartz is cut (relative to its crystallographic axes).

Prismatic crystals typically have 3, 4, 6, 8 or 12 faces which are parallel to a crystallographic axis.

In at least some instances, quartz is so disposed that the two minerals have a definite relation between their crystallographic axes.

In general they are not the same as the directions a, b and c of the crystallographic axes.

The pleochroic colours are at their maximum when light is polarized parallel with a crystallographic axis.