The price of mica is primarily driven by its purity, particle size (mesh), and thermal stability. For industrial applications, ensure the silica (SiO2) and alumina (Al2O3) content meets your specific industry standards. In the electronics sector, dielectric strength and insulation resistance are critical benchmarks. For cosmetic or paint grades, the whiteness index and luster (pearlescent effect) are the main price drivers. Always request a Certificate of Analysis (COA) to verify these chemical and physical properties before finalizing a purchase.