The beds consist of selenitic and calcareous schists and beds of clay, mixed with numerous beds of pyrites.
A mixture of common salt assists the decomposition of the pyrites.
How would blende compare with pyrites as a source of sulphur for sulphuric acid making?
The one is galena, a sulphuret of lead; the other, pyrites, a sulphuret of iron.
Whenever a heavy deposit of pyrites, or mundic, is found mineral probably exists below.
pyrites, when thrown upon a spirit, are believed to drive it away.
Then too, there is pyrites, or lapis fissilis, from which sulphur is melted.
The pyrites are not the only minerals from which Vitriol may be procured.
The apparatus is so easy of installation that it may be applied without much expense to pyrites furnaces already in operation.
Lastly, gold is found in pyrites, though rarely in large quantities.
"metallic iron disulfide, fool's gold," 1550s, from Old French pyrite (12c.), from Latin pyrites, from Greek pyrites lithos "stone of fire, flint" (so called because it glitters), from pyrites "of or in fire," from pyr (genitive pyros) "fire" (see fire (n.)). Related: Pyritic.
A silver to yellow, metallic, cubic mineral. Pyrite often crystallizes in cubes or octahedrons but also occurs as shapeless masses of grains. It occurs in most types of rocks, and is used as a source of iron and in making sulfur dioxide. It is a polymorph of marcasite. Because of its shiny look and often yellow color, it is sometimes mistaken for gold and for this reason is also called fool's gold. Chemical formula: FeS2.