Augite, a mineral that belongs to the pyroxene group, is known for its black or dark green color. While augite is the most common pyroxene in igneous rocks, there are several other minerals that can be used as synonyms for augite, depending on their composition and crystal structure. Diopside, hedenbergite, and enstatite are some of the examples of minerals that can be used as synonyms for augite. These minerals are all pyroxenes with different chemical compositions and crystal structures. For instance, diopside is a calcium magnesium silicate pyroxene, while enstatite is a magnesium iron silicate pyroxene. Despite these differences, these minerals share some similarities with augite, such as their dark color, opaque nature, and prismatic crystal habit.