Amphiboles are a group of silicate minerals that are typically dark-colored and form in high-temperature and high-pressure environments. They are characterized by their elongated crystal structure and are commonly found in igneous and metamorphic rocks. Amphiboles contain iron, magnesium, and other elements, which contribute to their diverse chemical compositions. These minerals play a significant role in geology and can influence the properties of rocks. Some common types of amphiboles include hornblende and tremolite. Amphiboles are also important in understanding the conditions under which rocks form and can be indicators of geological processes.