Vietnam or Thailand ? Vote for the TOP Country of the Week !
If it contain any saline substances, for example, the sulphates of soda or magnesia, their quantities must be very insignificant. In Italy, the Pisciarelli of the lake Agnano have a temperature equal to 93 degrees. It cannot proceed from the decomposition of sulphurets of iron, or pyritic strata.
Newbery found that gold could also be deposited on sulphurets without any other reagent. He says: "In our mineral sulphurets, however, we have agents which are not only capable of reducing gold and silver from solution, but besides are capable of locating them when so reduced in coherent and bulky masses.
By the windows in the northern wall of the room are deposited the beautiful crystallised mass of Selenite, or sulphate of lime, found in the duchy of Saxe Coburg, and presented to the museum by Prince Albert; and a mass of carbonate of lime, presented by Sir Thomas Baring. Five of the tables are loaded with further specimens of the Sulphurets, or metals in combination with sulphuric acid.
In a paper read before the Aix-la-Chapelle section of the Verein deutscher Ingenieure, Herr Robert Hasenclever presents a summary of the results obtained with various methods for the absorption of the sulphurous acid generated during the roasting of zinc-blende and other sulphurets.
Mr. Rosales then tells his readers, what we all know must be the case, that the gold would be volatilised by the heat, as would be also the other metals, which he says, were in the form of arseniurets and sulphurets; but he fails to explain how the sublimated metals afterwards reassumed their metallic form.
Direct experiment with internal heat has not, however, been carried beyond 2000 feet below the surface, and as the ratio of increment diminishes with the depth, that above assigned to the temperature of 110 degrees is no doubt much too little. The Momay springs more probably owe their temperature to chemical decomposition of sulphurets of metals.
In the first case are sulphurets of copper, and copper iron; in the second case are the series of sulphurets of lead, or galena, from various parts of the world; in the third case are specimens of sulphuret of bismuth, needle ore, or sulphuret of bismuth, copper, and lead, and sulphurets of mercury, or cinnabar, chiefly from Spain, the light variety of which is the bright vermilion used by artists; in the fourth case are the sulphurets of silver, the beautiful crystallised sulphurets of antimony, chiefly from Transylvania, and the delicate plumose antimony, or feather ore; in the fifth case are the sulphur salts, including the ruby, silver, &c.; and in the sixth case are the sulphurets of Arsenic, red orpiment, of which the best comes from Persia, cobalt glance, &c., bringing the series of sulphurets to a conclusion.
It is insoluble in water, is powerfully electromotive, and is most strikingly energetic in numerous chemical agencies, its action on nearly all metallic bodies being to carry them at once to the state of peroxide, or to their highest point of oxidation; it changes sulphurets into sulphates, instantaneously destroys several gaseous compounds, and bleaches indigo, thus shewing its analogy with chlorine.
A miner, who might have sat for a study of "Tennessee's Partner," came down the hillside with a pan of "dirt," which he carefully washed in a muddy pool in the bed of the gulch. He showed me the result, a few "colors" and sulphurets. He said it would "go about five dollars to the ton," and seemed well satisfied with the result.
He then passed on to other substances; to oxides and chlorides, and iodides, and salts, and sulphurets, and found them all insulators when solid, and conductors when fused. In all cases, moreover, except one and this exception he thought might be apparent only he found the passage of the current across the fused compound to be accompanied by its decomposition.
Word Of The Day