Phyllite is a type of metamorphic rock that forms from the alteration of slate under heat and pressure. It is characterized by its shiny, reflective surface and a fine-grained texture. The minerals within phyllite, such as muscovite and chlorite, give it a distinctive sheen, making it visually appealing. Phyllite typically appears in shades of gray, green, or brown and is often used in construction and landscaping. Its layered structure allows it to be split into thin sheets, which can be utilized for roofing or decorative purposes. Overall, phyllite is an important rock in the study of geology and the processes of metamorphism.