Silica (silicon dioxide, SiO 2) occurs as the mineral quartz, a major constituent in many igneous and sedimentary rocks, and the most common detrital mineral in a commodity, the term silica is applied to quartz in all its forms — as vein or reef quartz, quartz pebbles, sandstone, quartzite, or as unconsolidated sand.
Industrial Sand Mining 101 An introduction to the uses and geology of industrial sand. ... It's silica, or SiO2. It's the most common silica crystal and the second most common mineral on the earth. And because of its chemical and physical properties, it's key in .