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The sodium of the latter combines with the silicic acid of the silicate, with the evolution of carbon dioxide, while about two thirds of the aluminium forms sodium aluminate and the remainder is converted into basic carbonate, or the oxide. The calcium and magnesium, if present, are changed to carbonates or oxides.
Weekes' apparatus, the silicate of potash became first turbid, then of a milky appearance; round the negative wire of the battery, dipped into the fluid, there gathered a quantity of GELATINOUS MATTER, a part of the process of considerable importance, considering that gelatin is one of the proximate principles, or first compounds, of which animal bodies are formed. From this matter Mr.
But when we find large nuggety masses of high carat gold in the beds of dead rivers, another origin has to be sought. As previously stated, there is fair reason to assume that at least three salts of gold have existed, and, possibly, may still be found in Nature silicate, sulphide, and chloride.
Again, the silicate may be properly made in the first place, but in a long exposure to the atmosphere the soda attracts carbonic acid, and the soda is liberated, and this has defeated my expectations more than once.
Hornblende a black or dark green mineral, an iron-magnesian silicate, about as hard as feldspar is sometimes found as a fourth constituent, and the rock is then known as HORNBLENDIC GRANITE. Granite is an acidic rock corresponding to rhyolite in chemical composition.
He pointed out another thing, a shrub called tuldum, with tiny yellow flowers on green stalks, good to tie round the arm to make one see far. Ras Bernas is a long, wandering cape composed of rocky hills of ironstone and silicate curiously blended together, with shoals and rocks, and coral reefs, and sandbanks hanging on to it in very shallow water.
There was the glistening yellow sulphuret from Cuba, the silicate from Brazil, the bright-blue carbonate from the sunny regions of the south, and the dark-brown oxide from the colder regions of the north.
Very thin gauze dipped in a solution of silicate of potash diluted with water, and dried, burns without flame, blackens, and carbonizes as if it were heated in a retort without contact of air. As a fire-proofing material it would be excellent were it not that the alkaline reaction of this glass very often changes the coloring matters of paintings and textile fabrics.
Another application of soluble glass has been made by surgeons for forming a protecting coat of silicate around broken limbs as a substitute for plaster, starch, or dextrine. The only use where soluble glass has met with success is in the preservation of porous stones, building materials, paintings in distemper, and painting on glass.
He, having prepared a solution of chloride of gold, added thereto a solution of silicate of potash, whereupon, as he states, the yellow colour of the chloride disappeared, and in half an hour the fluid turned blue, and a gelatinous dark-blue precipitate appeared and adhered to the sides of the vessel.
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