With regard to auriferous pyritous lodes, it does not appear even now to be clear, as some scientists assert, that their gold is never found in chemical combination with the sulphides of the base metals.
As to the size of a pyritous mass necessary to produce in this manner a large nugget, it is by no means considerable.
He still looked on volcanoes as due to the burning of "pyritous and combustible stones," though he now called in the co-operation of electricity.
The roasting in the open air, and in heaps more or less considerable, is practised upon iron ores, and such as are pyritous or bituminous.
The hydrogen becomes sulphuretted hydrogen, if there be much pyritous matter in the coal.
Selenium has been found likewise in a red sediment which forms upon the bottoms of the lead chambers in which oil of vitriol has been made from peculiar pyrites, or pyritous sulphur.
When it is proposed to extract the sulphur from the iron pyrites, or from pyritous minerals, different furnaces may be employed, among which that used in Hungary deserves notice.
It must be remembered that the grounds containing the amber are often replete with the sulphates of iron, alumina, and lime, or at least with the pyritous elements of these salts.
These are yellow and red shales, which seem to owe their colour to the spontaneous combustion of pyritous lignite, in the manner observed on the South Saskatchewan and the Mackenzie rivers.
A forty per cent pyritous or other sulphide ore should be roasted in a revolving furnace in thirty to forty minutes, and without any auxiliary fuel.
But this is the case; we find those fissures filled both with calcareous, gypseous, and pyritous substances.
After visiting the pyritous marls of the Rio Juagua, we continued following the course of the crevice, which stretches along like a narrow canal overshadowed by very lofty trees.
The marls, as the smell indicates, are pyritous and bituminous at the same time; and the petroleum springs at the Buen Pastor, and in the island of Trinidad, proceed probably from these same beds of alpine limestone.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "pyritous" in a variety of sentences. We hope that you will now be able to make sentences using this word.
