Forming the basis of all clays, aluminium silicates play a prominent part in the manufacture of pottery and porcelain.
Aluminium silicates are widely diffused in the mineral kingdom, being present in the commonest rock-forming minerals (felspars, &c.
In general, we say, dark, heavy silicatesare basic, and vice versa.
Chemically, the feldspars are silicates of aluminum and potassium, sodium or calcium.
Many silicates contain water, and some of these are of great geological importance.
These are complex, basic silicates of aluminum, magnesium, iron, potassium, and sodium.
A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.
They are all silicates of lime and magnesia with sometimes alumina and iron.
A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.
A term now used to designate any one of a family of minerals, hydrous silicates of alumina, with lime, soda, potash, or rarely baryta.
Other authors have sought the origin of the diamond in the action of the hydrated magnesian silicates on hydrocarbons derived from bituminous schists, or in the decomposition of metallic carbides.
Wolff, who have obtained it by dissolving graphite in a fused mixture of silicates having approximately the composition of the blue ground.
Citadel, Cairo, who attempted criticism, to be carbonate of copper, because rich silicates of that metal were shown at the Exposition.
Leaving the silicateswe find very few gem minerals remaining.
Now glasses are also silicates of various metals, but unlike gem minerals the glasses are not crystalline but rather amorphous, that is, without definite geometric form or definite internal arrangement.
Having thus introduced the silicates we may now consider which ones among the many mineral silicates furnish us with precious or semi-precious stones.
First in value among the silicates is beryl, which, when grass green, we call emerald.
This oxide of silicon is not free and separate in the silicates but is combined chemically with other oxides, chiefly with metallic oxides.
Perhaps thesilicates that are next in importance to the jeweler, after beryl, are those which form the garnets of various types.
Thus there are many different silicates because, in the earth, many different metallic oxides have combined with silicon oxide.
But such mortars may contain other ingredients besides lime, as, for example, clay and magnesia, when doublesilicates of great solidity are formed; on which account dolomite is a good ingredient in these mortars.
In the operations by which it is accomplished it will be seen that the soluble silicates (water glass) play an important part.
There are several native silicates of magnesia, more or less pure, of which, however, none is directly employed in medicine.
Chapman contests Plattner's opinion that, when silicates are fused with phosphor salt, the 'silica skeleton' that results is especially due to the presence of alkalies or earthy bases.
Soaps containing silicates may have a deleterious action upon the fibres, causing them to become damaged and broken.
Various silicates of economic value are asbestos, a variety of hornblende, and augite, which are silicates of magnesium and iron or calcium; and talc, which is a silicate of magnesium containing water.
Carbonates, silicates and oxides of zinc are found.
Na4SiO4 and Na2SiO3 are typical silicates of Na, but others exist.
Feldspar, mica, slate, and clay aresilicates of it.
Much earthy material--gangue--containing silica and silicatesis always found with iron ores.
Hydraulic mortar contains silicates of Al and Ca, and is not affected by water.
According to the result of Berthier’s analysis, we must consider them as silicates of iron.
At the early periods in which the materials of the ancient crystalline schists were accumulated, it cannot be doubted that the chemical processes which generated silicates were much more active than in more recent times.
As for quartz, it can be produced under the influence of heat by water holding alkaline silicates in solution, as in the case of the Plombieres springs.
Next to quartz, which is nearly pure silica or silicic acid, the most important are those silicates commonly classed under the several heads of feldspar, mica, hornblende or augite, and olivine.
As to the heat required, silicates may be produced in the moist way at about incipient red heat, whereas to form the same in the dry way would require a much higher temperature.
The earliest known glazes (Egyptian and Assyrian) were silicates of soda and lime containing very little alumina and no lead.
The silicates and aluminates of which Portland cement is composed are believed to exist not as individual units but as solid solutions of each other, these solid solutions taking the form of minerals recognizable as individuals.
Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.
The inference is, that the effect cannot be due to the clay as a whole, and Mr. Way has sought to explain it by supposing that there exist in the soil particular double silicates of alumina and lime.
Experience has shown that burning is by no means equally advantageous to all clays, but is most beneficial on those containing a considerable quantity of calcareous matter, and of silicates of potash.
Silicates of Potash and Soda have been employed with the view of supplying silica to the plant, but the results have been far from satisfactory.
Asbestos, meerschaum, beryl, garnet, jade, and hornblende are all silicates of various metals.
The natural silicates are very abundant and varied; orthoclase or potash felspar, and albite or soda felspar, are those which most commonly occur.
The compounds of silicon, however, are both plentiful and important, especially silica, the oxide, and the silicates or salts of silicic acid.
Glass is a complex mixture of insoluble silicates with excess of silica.
Lead or flint glass contains the silicates of lead and potassium; this is a dense glass, but at the same time rather soft.
As a result of the shortage of calcium there is a higher ration of silicates to carbonates than exists on earth.
There are no oxides, sulfides, silicates or chlorides.
The solution of the question will depend rather upon the properties of the silicates of lime and magnesia at high temperatures, than upon the action of these silicates upon iron.
As the scoria from bronze foundries is partly composed of these silicatesit is indubitable that a kind of glass was formed in the earliest metal-works where this alloy was made.
A silicate with a basis of soda and potash, combined with some particles of the silicates of iron and copper, which coloured it blue and green.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "silicates" in a variety of sentences. We hope that you will now be able to make sentences using this word.
