Ferrosilite is a mineral that belongs to the pyroxene group, primarily composed of iron and silicon. Its chemical formula is FeSiO3, and it typically forms in high-temperature environments, such as in igneous rocks. Ferrosilite is known for its dark color, often appearing black or dark green, and has a glassy luster. This mineral is significant in geology and petrology, as it can provide insights into the conditions under which certain rocks formed. Ferrosilite is commonly found in basalt and granite and can also be associated with other minerals like enstatite and augite.