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Seven Crystal Classes

# Seven Crystal Classes - Figure 1.14 Deﬁnition of axes...

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Unformatted text preview: Figure 1.14 Deﬁnition of axes, unit cell dimensions and angles for a general unit cell. Table 1.1 The seven crystal classes System Triclinic Monoclinic Orthorhombic Trigonal Hexagonal Tetragonal Cubic Unit cell a¢B¢y¢9m a¢b¢c a=y=90° B=#90° a¢b¢c a=B=Y=90° a¢b¢c ﬁ-a "ll 5 3 9-1:) CPU: @513: U‘u ll Do u ‘I'LII 6.4 6.4 h 3 3 an as: a-en as: Minimum symmetry requirements None One two-fold axis or one symmetry plane Any combination of three mutually perpendicular two-fold axes or planes of symmetry One three-fold axis One six-fold axis or one six—fold imprOper axis One four-fold axis or one four-fold improper axis Four three-fold axes at 109° 28' to each other ...
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