It occurs in primitive mountains; and is often accompanied with red silver ore, copper pyrites, and crystallized quartz.
It has the refulgency of copper pyrites, of gold, of Florentine bronze.
copper pyrites is also used in the Harz, as well as in Swansea and Glasgow.
The copper pyrites are roasted, dissolved in dilute sulphuric acid, and the liquid thus obtained is submitted to electrolysis.
The mine is practically a solid mass of iron and copper pyrites.
Mineral wealth of great value; manganese, copper pyrites, iron ore, and gold deposits have been found.
Whilst the colonel was looking for the sheriff, Ben had substituted bags of copper pyrites for bags of gold.
This slaty marlstone is richly impregnated with copper pyrites, for which it is extensively worked.
It yields in four months about one ton and a half of sulphur from copper pyrites.
copper pyrites, called vulgarly mundick, is a bisulphuret of copper.