Cerussite

Description

Cerussite is a lead carbonate mineral defined by the chemical formula PbCO3. Historically identified by terms such as lead-spar or white lead ore, it serves as a primary geological source for lead extraction. In the context of ceramic science, materials containing lead compounds like cerussite were traditionally utilized as potent fluxing agents in glaze formulations. These lead-based additives significantly lower the melting temperature of glass-forming mixtures, improve the flow properties of the melt, and impart a characteristic high-gloss finish with enhanced refractive index. However, due to the inherent toxicity of lead, its direct use in contemporary ceramic applications is strictly regulated and often substituted with safer alternatives.