Micas are a group of silicate minerals known for their layered structure and excellent cleavage, which allows them to split into thin, flexible sheets. Common types include muscovite and biotite. Muscovite, often transparent to light brown, is used in electrical insulators and as a glazing material in ceramics. Biotite, darker and rich in iron and magnesium, is prevalent in igneous and metamorphic rocks. Micas are important in geology for understanding rock formation and metamorphism. They are also valued in industrial applications for their heat resistance and electrical insulating properties. Their unique structure and physical properties make them versatile and essential in both natural and synthetic environments.