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Silicon dioxide
Any of the silica group of the silicate minerals
Silica is silicon dioxide, a compound of silicon which is found in sand, quartz, and flint, and which is used to make glass. a chemical compound that exists naturally as sand, quartz, and flint, used in making glass (silex )
It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder
Mineral that is composed of silicon dioxide, SiO2
Silica is an essential ingredient in the making of glass Most commonly derived from sand, pure silica is also used in the making of laboratory glass which is resistant to extremely high temperature
A hard, crystalline substance which is an essential ingredient in the manufacture of glass It occurs in nature in such mineral forms as sand, flint, quartz etc GANTAD
any material with the composition SiO2 Often refers to a Jello-like sub-stance with that composition which can act as a rock cement or solidify by itself as chert, flint, or jasper
Silicon dioxide, a mixture that is the main ingredient of glass The most common form of silica used in glassmaking has always been sand
is a chemical compound comprised of silicon and two oxygen atoms (SiO2)
The molecule formed of silicon and oxygen (SiO2) that is the basic building block of volcanic rocks and the most important factor controlling the fluidity of magma The higher a magma's silica content, the greater its viscosity or "stickiness "
{i} silicon dioxide, crystalline compound commonly found in sand and quartz (used to produce glass, cement, ceramic, and other products)
Silicon dioxide (SiO2) occurring in crystalline, amorphous and impure forms (as in quartz, opal and sand) (Precipitated silica)
A hard, glassy mineral Quartz and opal are two forms of silica Since much sand is made of quartz, silica is very common in sand Some marine organisms use silica to build their shells
Silicon dioxide This is a very common material, often forming the mineral quartz, but also forming flint, agate and much of the sand found on beaches and in sandstones Silicon and oxygen are both very common elements in the crust of the Earth, and therefore the proportion of silica present is used as a means of classifying igneous rocks into acid, intermediate and basic, the first being the richest in silica
(SiO2) containing varying percentages of water
a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechartelierite
Silica can be found in water as a natural forming mineral or an additive to public water supplies Silica is not regulated by the EPA and does not cause any health concerns However, silica can cause spotting of glassware, fixtures, and automobiles during the cleaning process
n silicon dioxide (SiO2); a main component in most igneous and metamorphic and many sedimentary rocks; often a cement or replacement for rocks and fossils; quartz
The common name for silicon dioxide A compound formed from silicon and oxygen Silica is a polymorph, that is, it exists in more than one state The states of silica are crystalline and noncrystalline (also called amorphous) Crystalline silica can take several forms: quartz (most common), cristobalite, tridymite, and four rare forms
A combination of silicon and oxygen The mineral form is called quartz
one of the earth's most abundant minerals and a vital ingredient in ceramic manufacture It is the basic component of glass as well as of ceramic glazes and high quality clayware bodies
a term for silicon carbide, usually quartz, a common mineral used in glass manufacture and in some instances glass decorating colors
A pigment made from quartz sand that has been crushed or ground A reinforcing filler for paints; it imparts burnish resistance, sheen uniformity and good flatting
the fundamental silicon-oxygen compound, which has the empirical formula SiO2, and forms the basis of quartz and certain types of sand
is a form of silicon and is found as quartz and sand flint It is used in the production of glass, ceramics and abrasives Back to Organisms page | Back to Coral Reef page
Silicon dioxide (Mineral consisting of or incorporating silica)
a chemically stable and refractory glass made from silica alone
  Silicon dioxide (SiO2)   Note 1: Silica may occur in crystalline or amorphous form, and occurs naturally in impure forms such as quartz and sand   Note 2:   Silica is the basic material of which the most common communication-grade optical fibers are presently made   [After FAA]
Silicon dioxide, SiO&?
silica gel
a granular, porous form of silica made synthetically from sodium silicate and used as a desiccant
silica glass
Any of various types of glass containing primarily silica in amorphous (non-crystalline) form
silica glasses
plural form of silica glass
silica group
A large group of silicate minerals having a silicon to oxygen ratio of 1: 2. This group includes many silicates of sodium, potassium, calcium, and aluminum in an open network structure
silica fume
Silica fume, also known as microsilica, is a byproduct of the reduction of high-purity quartz with coke in electric arc furnaces in the production of silicon and ferrosilicon alloys. Silica Fume is also collected as a byproduct in the production of other silicon alloys such as ferrochromium, ferromanganese, ferromagnesium, and calcium silicon (ACI Comm. 226 1987b). Before the mid-1970s, nearly all silica fume was discharged into the atmosphere. After environmental concerns necessitated the collection and landfilling of silica fume, it became economically justified to use silica fume in various applications, in particular high performance concrete
silica gel
Amorphous silica that resembles white sand and is used as a drying and dehumidifying agent, as a catalyst and catalyst carrier, as an anticaking agent in cosmetics, and in chromatography
silica gel
A highly absorbent 'sand' that is used to dry and preserve flower blossooms and leaves
silica gel
A desiccant (moisture absorbent) often packaged with electronic equipment or any other item that may be adversely affected by moisture
silica gel
A highly absorbent 'sand' that is used to dry and preserve flower blossoms and leaves
silica gel
A desiccant most commonly used in heat regenerative type dryers (099)
silica gel
A colloidal, highly absorbent silica used as a dehumidifying and dehydrating agent, as a catalyst carrier, and sometimes as a catalyst Because of its internal pore structure, it can be used in liquid separation processes
silica gel
Amorphous silica, prepared in formation with water Removal of the liquid creates xerogels and further treatment with alcohol creates aerogels Silica gels are used as drying agents and to alter viscosity of liquids
silica gel
a porous form of silica that is highly absorbent
silica mineral
Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically
The act or process of combining or impregnating with silicon or silica; the state of being so combined or impregnated: "silicification of wood"
impregnation with silica; petrification
The introduction of, or replacement by, silica, esp in the form of fine-grained quartz, chalcedony, or opal, which may fill pores and replace existing minerals
Process whereby silica replaces the original material of a substance For example, silicified wood
Thae act or process of combining or impregnating with silicon or silica; the state of being so combined or impregnated; as, the silicification of wood



    Türkische aussprache



    /ˈsələkə/ /ˈsɪləkə/


    [ 'si-li-k& ] (noun.) circa 1801. Origin: 1585–95; in Latin silex (“hard stone, flint”). Subsequently, silicon was first identified by the chemist Antoine Lavoisier in 1787 as a component element of the silex, or silicis for flint, and more generally what were termed "flints" during the era, nowadays as we would say "silica" or more formally, silicate.

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