Our company exploits the mine of high purity quartz in Russia, Ural. We sell this quartz in Russia and to different countries Our quartz is the very high quality (min 99, 98% SiO2) . The impurieties contents of some components: Ca-10 ppm, Fe-20 ppm, Ti-10 ppm, Al-20 ppm, Na-30 ppm, K-30 ppm, Mg-7 ppm. Exact composition confirmed by the certificate on the demand.