silica(redirected from siliceous, silicious)
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A white or colorless crystalline compound, SiO2, which in the form of quartz and certain other minerals is a chief component of the earth's crust. Silica sand is used in making a wide variety of materials, such as glass and concrete.
[New Latin, from Latin silex, silic-, hard stone, flint.]
1. (Elements & Compounds) the dioxide of silicon, occurring naturally as quartz, cristobalite, and tridymite. It is a refractory insoluble material used in the manufacture of glass, ceramics, and abrasives
2. (Elements & Compounds) short for silica glass
[C19: New Latin, from Latin: silex]
sil•i•ca(ˈsɪl ɪ kə)
the dioxide form of silicon, SiO2, occurring esp. as quartz sand, flint, and agate: used chiefly in the manufacture of glass, water glass, ceramics, and abrasives.
[1795–1805; < New Latin, derivative of Latin silex hard stone, flint, boulder]
Silicon dioxide, SiO2, a compound that occurs widely in rocks and mineral forms, such as quartz, sand, and flint, and is used to make glass, concrete, and other materials.
siliceous (sĭ-lĭsh′əs) adjective
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|Noun||1.||silica - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite|
cristobalite - a white mineral consisting of silica; found in volcanic rocks
quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
chert - variety of silica containing microcrystalline quartz
flint - a hard kind of stone; a form of silica more opaque than chalcedony
lechatelierite, quartz, quartz glass, vitreous silica, crystal - colorless glass made of almost pure silica
oxide - any compound of oxygen with another element or a radical
silex - a pure form of finely ground silica
tridymite - a mineral form of silica