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In assigning point groups to six crystal systems, those members of the
hexagonal system that may be assigned rhombohedral crystallographic axes a
r belong to the rhombohedral division of the hexagonal system. They
have a unique triad, but not all point groups with a unique triad may be
assigned rhombohedral axes; hence, not all trigonal point groups are
rhombohedral. CF: trigonal;
trigonal system.
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