Massicot is a yellow lead oxide mineral, primarily composed of lead(II) oxide (PbO). It is often found in the oxidation zones of lead deposits and can occur in various forms, including crystalline and amorphous. Historically, massicot has been used as a pigment in paints and ceramics due to its vibrant color and opacity. In addition to its use in art, massicot has applications in the production of lead glass and as a precursor for other lead compounds. However, due to the toxicity of lead, its use has declined, and safety regulations now limit its application in many industries, including paint and ceramics.