4768 Silica Silica is found in barley. The chemical compound silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with a chemical formula of SiO2 and has been known for its hardness since antiquity. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. Silica is the most abundant mineral in the Earth's crust. Silica has been shown to exhibit immunosuppressant, hypocholesterolemic, anti-allergenic, anti-apoptotic and anti-histamine functions (A7884, A7885, A7886, A7887, A7886). Silica belongs to the family of Metalloid Oxides. These are inorganic compounds containing an oxygen atom of an oxidation state of -2, in which the heaviest atom bonded to the oxygen is a metalloid. 7631-86-9 24261 O2Si 60.084 White powder. 1716 - 1736 °C Crystalline silica in the form of quartz or cristobalite dust is carcinogenic to humans (Group 1). Amorphous silica is not classifiable as to its carcinogenicity to humans (Group 3). (L135) 2014-09-11T02:06:06Z 2026-05-14T19:07:14Z http://en.wikipedia.org/wiki/Silica C16459 30563 DB11132 true O=[Si]=O O2Si InChI=1S/O2Si/c1-3-2 VYPSYNLAJGMNEJ-UHFFFAOYSA-N 60.0843 59.966755777 Exogenous Solid -0.66 HMDB35659 22683 CHEM003671 DTXSID1049770 NS00096378 silanedione 34.14 2.8858 3.2811468900078617 0 2 0 -8.532702804224158 0 0 Inorganic compounds Mixed metal/non-metal compounds Metalloid organides Metalloid oxides 403842 CED0000531