Sericite

Description

Sericite represents a fine-grained, foliated variety of white mica, encompassing minerals such as muscovite, illite, or paragonite. Geologically, it forms through the hydrothermal alteration of feldspar minerals, including orthoclase and plagioclase, and serves as a characteristic constituent contributing to the characteristic luster found in metamorphic rocks like phyllite and schist. Chemically identified as a hydrated aluminosilicate—often represented by the composition (Na2O-K2O)·3Al2O3·6SiO2·2H2O—the mineral exhibits a distinct platy, sheet-like particle morphology. Within the field of ceramics, its physical structure and chemical composition make it a functional additive for modulating glaze and body properties, often utilized for its talc-like behavior and technical contributions to material stability.