The seven crystal systems are a method of classifying crystals according to their atomic lattice or structure. In crystallography one of the structural groups to which crystalline solids can be classified is the monoclinic crystal system.Three vectors define a crystal-system. All the forms of monoclinic system are found in the crystals of this system also. The three axes of the unit cell (a, b and c) are unequal. Two of them, the A and C axes, meet at 90°, but the third one does not. It represents the arrangement of atoms in a material having monoclinic structure. The minerals … Monoclinic. Monoclinic sulphur is an example of monoclinic crystal system. The Monoclinic System. The previously discussed crystal systems all have axes/sides that meet at 90 º. These systems include the isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic systems. The hexagonal crystal system is further broken down into the hexagonal and rhombohedral divisions. Minerals in the Monoclinic crystal system. In crystallography, the monoclinic crystal system is one of the 7 lattice point groups.A crystal system is described by three vectors. There are approximately 495 minerals in the monoclinic crystal system, and it is well represented in the gemstone and mineral industry. The shape of the lattice determines not only which crystal system the stone belongs to, but all of its physical properties and appearance. The unique symmetry operation in a monoclinicThe unique symmetry operation in a monoclinic system is 2/m – a twofold axis of rotation with a mirror plane. Each crystal class is a member of one of six crystal systems. A monoclinic unit cell is the unit cell of monoclinic crystal system. In the monoclinic system, the crystal is described by vectors of unequal length, as in the orthorhombic system. Three axes of unequal lengths say crystals in this system, a, b, and c of which an is perpendicular to b and c but b and c are not perpendicular to one another. In the monoclinic system, two of the axes, A and C, meet at 90 º, but axis B does not. Monoclinic crystals have two forms: pinacoids andMonoclinic crystals … They form a rectangular prism with a parallelogram as base. Acanthite Achalaite Actinolite Acuminite Adanite Admontite Adolfpateraite Aegirine Aegirine-augite Aerinite Aerugite Afwillite Agricolaite Aguilarite Ahlfeldite Airdite Akaganeite Akaogiite Aklimaite Akopovaite Akrochordite … In the monoclinic system all the axes are different lengths. b is the rotation, while a and clie in the mirror plane. The monoclinic unit has a rectangular shape with a parallelogram as its base. The above crystal systems all have axes sides that meet at 90°. If the crystal is uniaxial it belongs to the tetragonal or hexagonal crystal systems, if it is biaxial it belongs to the orthorhombic, monoclinic, or triclinic crystal systems. Shapes of unit cells are determined by the crystal system, with the following results: What are the characteristics of the crystal system? The main feature of the forms of the triclinic system is that each form has only two faces symmetrical with respect to the centre of symmetry of the crystal. The atomic lattice is a three dimensional network of atoms that are arranged in a symmetrical pattern. All axes in the monoclinic system are different lengths. Fifteen different forms are possible within the isometric system.