What is phylloite?

Answer 1

Phylloite is a phyllosilicate mineral belonging to the mica group, characterized by its layered structure and fine-grained texture. It is typically formed under low to moderate temperature and pressure conditions during the metamorphism of clay-rich rocks. Phylloite is often used as an indicator of metamorphic conditions and can contain various cations, including magnesium, iron, and aluminum, which contribute to its properties. Its name is derived from the Greek word "phyllon," meaning leaf, reflecting its sheet-like appearance.