Hedenbergite is a mineral species that belongs to the pyroxene group. It is a rare mineral, and its synonyms include kosmochlor, titanium-rich augite, and brown diopside. Hedenbergite typically forms in igneous and metamorphic rocks, including basalt, gabbro, and skarn. Its chemical formula is CaFeSi2O6, and it contains a high percentage of iron and calcium. Hedenbergite is known for its deep green to black coloration and has a vitreous to resinous luster. It is commonly found in association with other minerals such as magnetite, pyrite, and quartz. Despite its rarity, hedenbergite remains an important mineral for scientific research, particularly in the fields of geology and mineralogy.