
1) Agate material 2) Agate mineral 3) Cement ingredient 4) Component in glass 5) Crystal, essentially 6) Dehumidifying gel 7) Desiccant gel 8) Flint is a form of it 9) Glass base 10) Glass component 11) Glass ingredient 12) Glass manufacturing dioxide 13) Glassy mineral found in sand 14) Ingredient in ceramics
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1) Chert 2) Cherty 3) Flint 4) Silex
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https://www.crosswordclues.com/clue/silica

A chemical combination of silicon and oxygen.
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html

A chemical combination of silicon and oxygen .
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http://midju.tripod.com/glossary.html

• (n.) Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
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http://thinkexist.com/dictionary/meaning/silica/

A chemical combination of silicon and oxygen
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http://volcano.oregonstate.edu/glossary/1

compound of the two most abundant elements in the Earth`s crust, silicon and oxygen, SiO2. The mass of the Earth`s crust is 59 percent silica, the ... [40 related articles]
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http://www.britannica.com/eb/a-z/s/94

Silica is the common name for silicon dioxide, SiO2.It exists in nature as crystalline quartz.
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http://www.chemicalglossary.net/definition/1498-Silica

A white or colorless mineral composed of silicon dioxide (SiO
2). It occurs commonly as quartz and sand, and in many other familiar rocks and minerals, including flint, granite, amethyst, and rock-crystal. Silica is refractory and inert, though it dissolves in hydrogen fluoride...
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http://www.daviddarling.info/encyclopedia/S/silica.html

Abscesses, wounds that are slow to heal, toothache and earache, and similar localized infections. Silica is a mineral prepared from sand or flint rock. Homepaths tend to use it more for long-term prescriptions than for everyday ailments. However its can be very useful for treating pus-filled or suppurating wounds, since it encourages the body to ex...
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http://www.encyclo.co.uk/local/20512

Fine particulate dust from quartz rock that is known to cause a progressive lung injury over long-term. ... See: pneumoconiosis. ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973

(sil´ĭ-kә) silicon dioxide, which occurs in nature as agate, amethyst, sand, quartz, chalcedony, cristobalite, and flint; it is one of the major constituents of dental porcelain, and in granular form serves as a dental abrasive and polishing agent. See also silicosis.
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http://www.encyclo.co.uk/local/21001

A chemical combination of silicon and oxygen.
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http://www.encyclo.co.uk/local/21455

Radical of silicon and oxygen. Also term for any material composed of only silicon and oxygen (and can include water), such as Quartz, Chalcedony, and Opal.
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http://www.encyclo.co.uk/local/22291
Sil'i·ca noun [ New Latin , from Latin
silex ,
silics , a flint.]
(Chemistry) Silicon dioxide, SiO.... It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
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http://www.encyclo.co.uk/webster/S/102

A chemical combination of silicon and oxygen. It is a structural component in many organisms, such as diatoms.
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http://www.fossilmall.com/Science/Glossary.htm

A white or colorless compound (SiO
2) occurring as quartz, sand, flint, agate, and many other minerals
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http://www.masoncontractors.org/aboutmasonry/masonryglossary/

Silica refers to silicon dioxide (SiO2). A very common mineral that is found in many forms including quartz, opal, chert.
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An oxide of silicon with the chemical formula SiO2. It is most commonly found in nature as quartz or as a component of sand.
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http://www.scientificpsychic.com/etc/geology-glossary.html

amorphous silicon dioxide (glass). It is a structural component in many organisms, such as diatoms and horsetails.
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http://www.ucmp.berkeley.edu/glossary/glossary_3.html

A hard, insoluble white, colourless solid with a very high melting point.
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http://www.vidyagyaan.com/general-knowledge/basic-chemistry-element-terms-a

also known as silicon dioxide - sand or ground quartz
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https://sciencetrek.org/sciencetrek/topics/soil/glossary.cfm
silicon oxide noun 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
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https://www.encyclo.co.uk/local/20974

Another name for silicon dioxide, the basic building block of volcanic rocks. Silica is a major constituent of most magmas and the amount of silica controls the viscosity of the magma
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https://www.encyclo.co.uk/local/21337

Naturally occurring silica occurs in deposits which are 99 percent silicon dioxide. The hardness provides both mechanical strength and abrasion resistance. Silica's are an economical extender-filler which is thermally stable, pure, low in ionic impurities, and hard. They are often used as antiblocking agents in polyolefin's.
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https://www.encyclo.co.uk/local/23693
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