118degree

118degree is a term that can refer to a specific angle measurement. In geometry, an angle of 118 degrees is an obtuse angle, as it is greater than 90 degrees and less than 180 degrees. This particular angle is significant in crystallography, representing the approximate angle between the two axes in the monoclinic crystal system. The monoclinic system is one of the seven crystal systems used to classify crystalline substances based on their internal lattice structure.

In the context of materials science and mineralogy, observing angles close to 118 degrees can provide clues about the crystalline structure of a substance. For instance, certain minerals, such as orthoclase feldspar, exhibit forms that show angles around this value when viewed in cross-section. This angle is not a universal constant but rather a characteristic feature of specific crystal structures. Understanding these precise angular relationships is crucial for identifying minerals and understanding the physical properties of crystalline materials, including their hardness, cleavage, and optical characteristics. The accuracy of such measurements often relies on techniques like microscopy and X-ray diffraction.