The Epidote Group is a collection of minerals that share similar chemical compositions and crystal structures. The most well-known member of this group is epidote, which is characterized by its greenish color and often forms in metamorphic rocks. These minerals typically contain calcium, aluminum, and silicate, and they can be found in various geological environments. Members of the Epidote Group are important in geology because they can indicate the conditions under which rocks formed. Other minerals in this group include clinozoisite and zoisite, which also have similar properties but differ slightly in their crystal structures. Understanding these minerals helps geologists interpret the history of rock formations.