Asbestos is not a single mineral but a group of fibrous silicate minerals. The term "magnesium silicate" broadly refers to the chrysotile type (white asbestos), which is a hydrated magnesium silicate. However, other types like crocidolite contain iron and sodium. "Asbestos" is the commercial name for these fibrous minerals, not a specific chemical formula. Sodium silicate (water glass), lead tetraoxide (red lead), and sodium nitrate are different compounds.