anfíbolo

Amphibole is a group of inosilicate minerals. They are characterized by their double-chain crystal structure and their general formula A2B5(Si6Al2)O22(OH)2, where A and B are cations such as sodium, magnesium, iron, and calcium. Amphiboles are classified into two main series: the orthorhombic amphiboles and the monoclinic amphiboles, distinguished by their crystal systems.

Common examples of amphiboles include hornblende, actinolite, and tremolite. Hornblende is a complex mineral often found in igneous and metamorphic rocks, typically appearing dark green to black. Actinolite and tremolite are members of the tremolite-actinolite series, characterized by varying ratios of magnesium and iron. These minerals are often found in metamorphosed mafic igneous rocks and carbonate rocks.

Amphiboles are important rock-forming minerals and are significant in the study of geology, particularly in understanding the conditions under which rocks form and transform. Their presence and composition can provide clues about the temperature, pressure, and chemical environment of geological processes. Some amphiboles can also be used as indicators of mineral deposits.