**The patterns of periodic 2-D arrays of repeated motifs summarized**

In the previous Parts we have discussed the ten planar Point Groups and the seventeen Plane Groups possible with respect to **two-dimensional periodic patterns**.

In the following we will summarize the results.

Figure 1. *Summary of the 2-D lattices, planar Point Groups and Plane Groups.*

In what follows are the 17 2-D patterns -- representing the 17 Plane Groups -- as discussed in the previous Parts. They are given here in the order in which they were discussed.

This

In the next Part we will utilize the knowledge we've gained so far, in order to begin to understand the development of 'faces' (and with it the shapes) of 2-D crystals. All this is necessary to finally understand __three__-dimensional shapes of natural inorganic beings (3-D crystals).

To continue, click HERE for Part Eight.