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<p>(APF) is the fraction of volume that is occupied by atoms. The cP lattice has an APF of about 0.524, the cI lattice an APF of about 0.680, and the cF lattice an APF of about 0.740.</p>

<p><big>Crystal classes</big></p>
<p>The isometric crystal system class names, point groups (in <a href="page.php?w=Schoenflies_notation">Schönflies notation</a>, <a href="page.php?w=Hermann-Mauguin_notation">Hermann-Mauguin notation</a>, <a href="page.php?w=orbifold">orbifold</a>, and <a href="page.php?w=Coxeter_notation">Coxeter notation</a>), type, examples, international</p><p>
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