A specimen of the only mineral brought back appeared to be iron pyrites embedded in quartz.
This was the famous load of gold that proved to be iron pyrites.
Besides the ore, masses of iron pyrites had been thrown out, connected with galena.
Don't you know the difference between gold and iron pyrites yet?
Pyrite, pī′rīt, n. native iron disulphide of a pale-yellow colour and very hard—also iron pyrites.
M. Dupont found in one of the Belgium caves a piece of iron pyrites, from which, with a flint, sparks could be struck.
The ores have, besides, a small quantity of selenium and iron pyrites intimately mixed with the cinnabar.
In some places, this clay drift yields balls of iron pyrites, which renders the water unpalatable.
Sulphur in iron pyrites also acts as a reducing agent upon litharge, and increases the apparent effect in a similar manner.
It is by this means that iron pyrites if exposed to the air after a time becomes converted into a sulphate of the metal.