In crystallography, the monocliniccrystal system is one of the 7 lattice point groups. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal length, as in the orthorhombic system. Two of the vectors are perpendicular, while the third makes an angle other than 90° with the plane formed by the first two.
There exist two monoclinic Bravais lattices: the simple monoclinic and the centered monoclinic lattices.
simple monoclinic
centered monoclinic
The point groups that fall under this crystal system are listed below, followed by their representations in international notation and Schoenflies notation, and mineral examples.
The axes are designated as follows: the inclined axis is a and slopes out of the paper towards the viewer, the vertical axis is c, and the remaining axis which is at right angle to the plane of the a and c axes is b.
The second monoclinicsymmetry class is m and represents a single vertical mirror plane (010) that includes the c and a crystallographic axes.
The third monoclinicsymmetry class is 2 and represents a 2-fold axis of rotation on the b crystallographic axis.
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