periodic lattice component

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**Figure:** T4's can crystallize all by themselves into a periodic lattice. To do so, they join diagonally.
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**Figure:** T4's can also combine with other small triangles to form crystal lattices, or even aperiodic ones when the joining rules are sufficiently flexible.
$\begin{figure}\centering\begin{picture}(300,160) \put(0,0){\epsfxsize =130pt \ep... ...s}} \put(170,0){\epsfxsize =130pt \epsffile{t04c.eps}} \end{picture}\end{figure}$

**Figure:** Because of their relatively small size, T4's can participate in many other lattices.
$\begin{figure}\centering\begin{picture}(150,190) \put(0,0){\epsfxsize =150pt \epsffile{latt4a.eps}} \end{picture}\end{figure}$

Jose Manuel Gomez Soto 2002-01-31