The term "monoclinic" refers to one of the seven crystal systems in crystallography. In this system, crystals are characterized by three unequal axes, with two of them intersecting at an angle that is not 90 degrees, while the third axis is perpendicular to the plane formed by the other two. This unique arrangement leads to distinct geometric shapes and properties. Common examples of monoclinic minerals include gypsum and orthoclase. These minerals exhibit specific symmetry and can be identified by their unique crystal forms. The monoclinic system plays a significant role in understanding the structure and behavior of various materials in geology and materials science.