Horneblende is a complex mineral belonging to the amphibole group, primarily composed of iron, magnesium, and silicate. It typically appears as dark green to black in color and has a glassy to dull luster. Horneblende is commonly found in igneous and metamorphic rocks, such as granite and gneiss, and plays a significant role in the geological processes that form these rocks. This mineral is important for understanding the conditions under which rocks form and can provide insights into the history of the Earth's crust. Horneblende is also used in various industrial applications, including the production of ceramics and as a component in some types of glass.