CMI (Clay Mineral Index)

Clay Mineral Index (CMI) is used to detect and map clay minerals on the Earth’s surface by analyzing the reflectance of specific shortwave infrared wavelengths that are sensitive to clay content. It helps identify areas rich in clay minerals such as kaolinite, illite, and montmorillonite. CMI values range from 0 to +1, where higher values indicate a higher concentration of clay minerals, while lower values suggest minimal or no clay presence. It is useful in geological mapping, soil analysis, and mineral exploration.