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Updated: May 29, 2025
John's wort, Clown's all-heal, elder, parsley, maidenhair, mineral drugs, such as lime, saltpetre, Armenian bole, crocus metallorum, or sulphuret of antimony; and thaumaturgic or mystical, of which the chief is, "My black powder against the plague, small-pox; purples, all sorts of feavers; Poyson; either, by Way of Prevention or after Infection."
When he has melted these substances and stirred them well up, and so obtained a complete mixture, he throws in air upon the surface to burn off all the sulphur from the remaining sulphuret of lead; and at last he gets an ingot of lead with platinum much lead, comparatively, and little platinum. He gets that in the crucible with a lot of scoriæ and other things, which he treats afterwards.
"A sulphuret of iron," said the professor, "or iron pyrites. In colour and appearance it is practically identical with gold. Indeed, in all ages," he went on, dropping at once into the classroom tone and adopting the professional habit of jumping backwards twenty centuries in order to explain anything properly, "it has been readily mistaken for the precious metal.
The copper ores of South Australia fetch a higher price at the Swansea sales than those from any other part of the world, not only because they are intrinsically rich, but because they are generally composed of carbonates, which are necessary to facilitate the smelting of the ores of sulphuret of copper from Cuba and other places.
There is a further remarkable mineral collection at the house, with fine specimens of sulphuret of tin and copper, malachite, fluor, crystals, topaz, with some blocks of prehistoric tin. The coast here extends to Gribbin Head, and there is then a sharp bend inward to Par sands.
These shistose pyrites being composed principally of coal, flint, alumina, and sulphuret of iron the latter in excess it was necessary to separate the sulphuret of iron, and transform it into sulphate as rapidly as possible. The sulphate obtained, the sulphuric acid could then be extracted. This was the object to be attained.
The regulus we have mentioned is simply the sulphuret deprived, by a preliminary operation, of its extraneous earthy matters; and this is frequently effected in the localities where it is produced, such as New Zealand and Chili, the expense of transport from these places being very considerable.
F. The conversion of the cyanide into the ferrocyanide is greatly facilitated by the presence of finely divided sulphuret of iron and caustic potash. Some years ago this salt was manufactured by a process which dispensed with the use of animal matter, the necessary nitrogen being obtained by a current of atmospheric air.
The sixth case is covered with Sulphurets, chiefly of iron, these being commonly known as iron pyrites. These specimens of the commonest of metallic ores are from various parts of the world. Upon this table also are deposited Lord Greenock's sulphuret of cadmium, commonly called greenockite; and sulphurets of nickel.
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.
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