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<a accesskey="3" href="page.php?w=crystal_structure&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=crystallography">crystallography</a>, <b>crystal structure</b> is a description of the ordered arrangement of <a href="page.php?w=atom">atom</a>s, <a href="page.php?w=ion">ion</a>s, or <a href="page.php?w=molecule">molecule</a>s in a <a href="page.php?w=crystal">crystalline material</a>. Ordered structures occur from the intrinsic nature of constituent particles to form symmetric patterns that repeat along the principal directions of <a href="page.php?w=Three-dimensional_space_%28mathematics%29">three-dimensional space</a> in</p><p>
<a accesskey="3" href="page.php?w=crystal_structure&amp;p=2">3.Next</a>
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