Phengite is a type of mineral that belongs to the mica group. It is a combination of two minerals - muscovite and paragonite - and is commonly found in metamorphic rocks. There are several different synonyms that can be used to describe phengite depending on the context. These include silver mica, alumina mica, lithium mica, and sericite. Silver mica refers to the mineral's metallic luster, while alumina mica highlights the mineral's composition. Lithium mica and sericite both relate to specific properties of the mineral, as phengite can contain lithium and is often used in cosmetic products due to its silky texture.