Symmetry groups {monoclinic symmetry group} can have rotation by 90 degrees. Crystals {monoclinic crystal}| can have one two-fold axis, two perpendicular same-length axes, and one non-perpendicular different-length axis, to make three crystal classes.
Physical Sciences>Chemistry>Inorganic>Phase>Phases>Solid>Crystal>Symmetry
5-Chemistry-Inorganic-Phase-Phases-Solid-Crystal-Symmetry
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Date Modified: 2022.0224