Amphibole is a group of silicate minerals that are commonly found in igneous and metamorphic rocks. These minerals are characterized by their double-chain silicate structure, which gives them unique physical properties. Amphiboles can vary in color, often appearing in shades of green, brown, or black, and they typically have a prismatic crystal habit. Amphibole minerals are important in geology as they can provide insights into the conditions under which rocks formed. Some common types of amphibole include hornblende and tremolite. They are also significant in industrial applications, such as in the production of asbestos, although some amphibole varieties are associated with health risks.