кварцевый дробильный кремнезем. Цена Высокий кварцевый песок Silica Sand. SandWikipedia. The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO 2), usually in the form of quartz, which, because of its chemical inertness and considerable hardness, is the most ...