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Topic: Silicate


In the News (Sat 25 Nov 17)

  
  Silicate Structures, Olivines, Garnets, & Aluminosilicates
In order to discuss the silicates and their structures it is first necessary to remember that the way atoms are packed together or coordinated by larger anions, like oxygen depends on the radius ratio of the cation to the anion, Rx/Rz.
Thus, this group is often referred to as the island silicate group.
In this case the basic structural group is Si The micas, clay minerals, chlorite, talc, and serpentine minerals are all based on this structure.
www.tulane.edu /~sanelson/eens211/silicate_structures.htm   (1029 words)

  
 Ethyl Silicate   (Site not responding. Last check: 2007-11-07)
At concentrations of 3,000 ppm, ethyl silicate causes extreme and intolerable irritation of the eyes and mucous membranes; at 1,200 ppm, it produces tearing of the eyes; at 700 ppm, it causes mild stinging of the eyes and nose; and at 250 ppm, it produces slight irritation of the eyes and nose [Hathaway et al.
Before a worker is placed in a job with a potential for exposure to ethyl silicate, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
Keep ethyl silicate out of a confined a space, such as a sewer, because of the possibility of an explosion, unless the sewer is designed to prevent the build-up of explosive concentrations.
www.osha.gov /SLTC/healthguidelines/ethylsilicate/recognition.html   (3752 words)

  
  Silicate Summary
Silicates in which the tetrahedra share three corners are called phyllosilicates or sheet silicates, because they tend to cleave into thin sheets.
Silicate minerals can be derived from the quartz, tridymite, and crystoballite structures by replacing a subset of the silicon ions with ions of a lower charge, together with placing other cations in places between tetrahedra to achieve overall neutrality.
In geology and astronomy, the term silicate is used to denote a type of rock that consists predominately of silicate minerals.
www.bookrags.com /Silicate   (1330 words)

  
  Silicate - Wikipedia, the free encyclopedia
In chemistry, a silicate is a compound containing an anion in which one or more central silicon atoms are surrounded by electronegative ligands.
Silicate anions, with a negative net electrical charge, must have that charge balanced by other cations to make an electrically neutral compound.
In geology and astronomy, the term silicate is used to denote types of rock that consists predominantly of silicate minerals.
en.wikipedia.org /wiki/Silicate   (485 words)

  
 Liquid Sodium Silicate Core Binder   (Site not responding. Last check: 2007-11-07)
Sodium Silicate is used as the binder that "glues" the sand together in cores.
There are numerous core binders available, but sodium silicate has a distinct advantage because the cores can be made at room temperature, not baked in ovens like most of the other types.
The object is to push the gas thru the core from one end to the other, and activate the sodium silicate to bind the sand.
www.budgetcastingsupply.com /Sodium_Silicate.html   (410 words)

  
 Silicate   (Site not responding. Last check: 2007-11-07)
It is also used to denote the salts of silica or of one of the silicic acid s.
Most of the Earth 's crust is made up of silicate rocks, as are the crusts of other terrestrial planets.
Insulite - Calcium silicate insulation manufacturers Manufacturers of calcium silicate insulation in board, brick and pipe cladding profiles for fire protection and pipe lagging use in refineries, refractories, marine, petrochemical and building sectors.
www.serebella.com /encyclopedia/article-Silicate.html   (536 words)

  
 Silicate minerals - Wikipedia, the free encyclopedia
They are classified based on the structure of their silicate anion group.
Phyllosilicates, sheet silicates, form parallel sheets of silicate tetrahedra with Si or a 2:5 ratio.
Tectosilicates, or "framework silicates", have a three-dimensional framework of silicate tetrahedra with SiO
en.wikipedia.org /wiki/Silicate_minerals   (182 words)

  
 Silicate Mineral Paint - the only truly Breathable Paint on the Market
The single most important property is silicate paint's breathablility or, in technical terms, water vapour permeance of 77 US perms which is about equal to house-wraps like Tyvek® and over 100 times as permeable as a 2-coat latex paint.
This means that Silicate Dispersion Paintis great for uses such as finishing of mineral-surfaces such as interior and exterior concrete, masonry, stucco and drywall, especially on walls where the breathability of the whole wall system could be ruined by an impermeable paint, such as in strawbale and adobe housing construction.
Silicate Paints imported from Europe have been used on the exterior of buildings such as the White House and the Empire State Building in New York.
www.elements.nb.ca /theme/building/henry/paint.htm   (558 words)

  
 Silicate Classification
Nearly all silicate mineral species can be placed in one of 6 distinctive structural groups based on the manner of polymerization or association of silica tetrahedral units.
As we consider the 6 silicate structural groups, we will find that the complexity of silica tetrahedral polymerization follows in the same order as the Bowen reaction series-the order of crystallization of primary silicate minerals from solid solution igneous magma during cooling from high to low temperatures.
In general, silicate mineral stability is related to the degree of polymerization of Si tetrahedra.
www.soils.umn.edu /academics/classes/soil5311/Lectures/notes/silicate_classification.html   (2244 words)

  
 silicate
Silicates may be considered chemically as salts of the various silicic acids.
Silicates are widely distributed in nature, making up most of the earth's outer crust.
A pioneer in silicate and molecular sieve chemistry,...
www.factmonster.com /ce6/sci/A0845226.html   (192 words)

  
 PSRD:: Silicate Stardust in Meteorites   (Site not responding. Last check: 2007-11-07)
The relative abundances of presolar silicates in different types of meteorites will help cosmochemists understand the processes of heating and chemical reaction that took place in the cloud of gas and dust in which the Sun and planets formed.
Silicates are not resistant to acids, so were lost during the process.
Most important for the hunt for presolar silicates is the ability to raster the beam over a region packed with hundreds or thousands of grains, allowing automatic measurements of a large number of grains in a relatively short time.
www.psrd.hawaii.edu /June04/silicatesMeteorites.html   (2081 words)

  
 silicate
Pyroxenes are single chain silicates, with chains of linked tetrahedra extending in one direction through the structure; amphiboles are similar but have double chains of tetrahedra.
In micas, which are sheet silicates, the tetrahedra are joined to form continuous sheets that are stacked upon one another.
Framework silicates, such as feldspars and quartz, are based on three-dimensional frameworks of tetrahedra in which all oxygens are shared.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0027830.html   (370 words)

  
 Search Results for "silicate"
...Any of various water-soluble silicate glass compounds used as a preservative for eggs, in plaster and cement, and in various purification and refining processes....
...A mineral silicate of iron and magnesium, principally (Mg, Fe)2SiO4, found in igneous and metamorphic rocks and used as a structural material in refractories and...
...An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.
www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=col61&x=10&y=12&query=silicate   (319 words)

  
 Understanding Our Products - Silicate Solution Chemistry
Sodium and potassium silicates are composed of a mix of silicate anions whose composition and handling can substantially affect the performance of the products in which they are used.
PQ, as the leader in silicate technology, continues to develop characterization methods that contribute to the ability of our customers to (1) understand and manipulate silicate product properties, and (2) to improve their own products and processes in which silicates are used, in order to be more competitive in their marketplace.
The fundamental building block of silicate solutions is the tetrahedral silicate anion with a silicon atom at the center of an oxygen-cornered, four sided pyramid (illustrated as the monomer in Figure 1a).
www.pqcorp.com /technicalservice/understanding_silicatesolchem.asp   (1242 words)

  
 Highbeam Encyclopedia - Search Results for silicate   (Site not responding. Last check: 2007-11-07)
or chain silicate Any of a class of inorganic compounds that have structures characterized by silicate tetrahedrons (a central silicon atom surrounded by four oxygen atoms at the corners of a tetrahedron) arranged in chains.
Biotite is a layer silicate structure in which aluminum and silicon occur in infinitely extending Si-Al-O sheets that alternate with potassium-rich...
Cummingtonite is an amphibole mineral, an iron and magnesium silicate that occurs in metamorphic rocks in the form of long needlelike, fibrous crystals.
www.encyclopedia.com /SearchResults.aspx?Q=silicate&StartAt=11   (824 words)

  
 Frontier Power Products - Low Silicate Antifreeze   (Site not responding. Last check: 2007-11-07)
In newer automotive applications, silicates are needed to protect aluminum engine parts and radiators from corrosion, and are used in virtually all antifreeze mixtures in varying forms and amounts.
Eventually, silicates are supposed to drop out of the coolant mix, and as long as they do so at a controlled rate, they work quite well.
Silicate gel also carriers abrasive particles to the water pump, where it wears away pump seals causing leakage and failure.
www.frontierequip.com /service/lowsilicate.htm   (297 words)

  
 Silicate carbon stars as seen by ISO   (Site not responding. Last check: 2007-11-07)
Because silicate dust is normally formed and observed in the oxygen-rich environment, the origin of the silicate emission in these stars has been a big puzzle as well as the evolution of these stars, since their first discovery by the IRAS/LRS (Willems and de Jong 1986; Little-Marenin 1986).
These objects show prominent crystalline silicate features in the 30 micron region, in contrast to the ``traditional'' silicate carbon stars in which 10 and 18 micron amorphous silicate bands are dominant.
In this object, silicate dust is probably in the equatorial disk.
www.iso.vilspa.esa.es /meetings/paris/Paris_abstracts/node210.html   (450 words)

  
 Potassium Silicate Masonry Paints and Stains - Edison Coatings, Inc.
Potassium silicate masonry paints have been in use for over a century to provide extremely durable, breathable color coatings on all types of mineralbased substrates, including stone, masonry, concrete and cement plaster (stucco).
Although soluble silicates can be air dried to form a film, maximum water resistance, bond strength and long-term durability depend on chemical reactions with the substrate or added catalysts.
Previous cementitious and silicate mineral coatings must be spot tested for compatibility in an inconspicuous area prior to large scale application.
www.edisoncoatings.com /html/Potassium_Silicate_Masonry_Pai/potassium_silicate_masonry_pai.html   (981 words)

  
 Sulfur vs. Silicate
Since pieces of the Moon have been directly sampled and found to be made of silicate minerals (minerals with silicon and oxygen), scientists have suggested that most of Io is also made of silicates.
The presence of mountains with 9 km of relief suggests silicate material is involved because sulfur and its compounds does not have enough strength to support such features.
Silicate volcanism is probably high-volume low viscosity (basalt) lava flows erupted from low shields and possible fissures.
volcano.und.nodak.edu /vwdocs/planet_volcano/Io/svs.html   (699 words)

  
 MSA's Rock'n Internet Site--Silicates   (Site not responding. Last check: 2007-11-07)
The silicate mineral class is considered to be the most important of all the mineral classes.
Nearly 90% of the igneous rock-forming minerals are silicates, which means that they make up over 90% of the Earth's crust (oxides are the other dominant mineral group).
The fundamental unit on which the structure of all silicates is based consists of 4 oxygen ions surrounding a silicon ion.
www.minsocam.org /MSA/K12/groups/silicates.html   (231 words)

  
 silicate - Search Results - MSN Encarta
Sodium Silicate, white crystalline solid; its chemical formula is Na SiO
Sodium silicate is formed when sodium carbonate (Na) and silicon...
Silicate minerals comprise about one third of all known natural crystalline materials, and 95 per cent of the rocks of the Earth’s crust consist of...
uk.encarta.msn.com /silicate.html   (116 words)

  
 Mineral Gallery - the Silicate Class
The silicates are the largest, the most interesting and the most complicated class of minerals by far.
Sorosilicates have two silicate tetrahedrons that are linked by one oxygen ion and thus the basic chemical unit is the anion group (Si2O7) with a negative six charge (-6).
In the double chain silicates the cleavage angle is close to 120 and 60 degrees forming rhombic cross sections making a convenient way to distinguish double chain silicates from single chain silicates.
mineral.galleries.com /minerals/silicate/class.htm   (1499 words)

  
 Silicate carbon stars as seen by ISO   (Site not responding. Last check: 2007-11-07)
Because silicate dust is normally formed and observed in the oxygen-rich environment, the origin of the silicate emission in these stars has been a big puzzle as well as the evolution of these stars, since their first discovery by the IRAS/LRS (Willems and de Jong 1986; Little-Marenin 1986).
These objects show prominent crystalline silicate features in the 30 micron region, in contrast to the ``traditional'' silicate carbon stars in which 10 and 18 micron amorphous silicate bands are dominant.
In this object, silicate dust is probably in the equatorial disk.
isowww.estec.esa.nl /meetings/paris/Paris_abstracts/node210.html   (450 words)

  
 Frequently Asked Questions---Leading Through Technology
Potassium silicates are more soluble, have higher rinseability, are less corrosive, have lower metal impurities, and don't effloresce (that is, bloom) as much as sodium silicate.
A: Sodium or potassium silicate formulations should be made up with softened water or with a chelating agent, such as polyphosphate or EDTA, to sequester the calcium and magnesium in hard water.
Carbon dioxide in the atmosphere reacts with the sodium in the sodium silicate coating to form sodium carbonate on the surface of the coating.
www.silicates.com /leading-faq.asp?bhjs=0   (1403 words)

  
 Definition of Silicate
It is also used to denote the salts of silica or of one of the silicic acids.
Most of the Earth's crust is made up of silicate rocks, as are the crusts of other terrestrial planets.
Mineralogically, silicate minerals are divided according to their molecular structure into the following groups:
www.wordiq.com /definition/Silicate   (217 words)

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