pyrite's Usage Examples:

The nickel ore of Sweden is magnetic pyrites, containing only a very small percentage of nickel, and generally occurs in diorite and greenstones.

The pyrites is subjected to dry distillation from out of iron or fire-clay tubular retorts at a bright red heat.

COPPER-PYRITES, or Chalcopyrite, a copper iron sulphide (CuFeS2), an important ore of copper.

Old schists, free from fossils and rich in quartz, overlie it in parallel chains through the whole length of the peninsula, especially in the central and highest ridges, and bear the ores of Chu-goku (the central provinces), principally copper pyrites and magnetic pyrites.

Metalliferous products containing silver arise in many operations; the chief products which may yield silver economically are copper and lead mattes, burnt argentiferous pyrites and certain drosses and scums.

The colour is usually pale bronze-yellow, often rather lighter than that of pyrites; on freshly fractured surfaces of pure marcasite the colour is tin-white, but this rapidly tarnishes on exposure to air.

The copper probably exists as disseminated chalcopyrite.

The best raw materials for the preparation of thallium are the flue-dusts produced industrially in the roasting of thalliferous pyrites and the "chamber muds" accumulating in vitriol-chambers wrought with such pyrites; in both it is frequently associated with selenium.

The outcrop of a metalliferous vein frequently manifests itself as a line of rocks stained with oxide of iron, often honeycombed and porous, the " gossan " or " eisen-hut," the iron oxide of which results from the decomposition of the pyrites, usually present as a constituent of such veins.

Then follows Portugal, with its important output of cupreous pyrites.

The conglomerate bands and quartzites contain large quantities of iron pyrites deposited subsequent to their formation, that in the conglomerates containing the gold.

Chalcopyrite is decomposed by nitric acid with separation of sulphur and formation of a green solution; ammonia added in excess to this solution changes the green colour to deep blue and precipitates red ferric hydroxide.

Newfoundland yields cupreous pyrites, worked at Pilley's Island, whilst the nickeliferous pyrites of Sudbury in Ontario is partly magnetic (see Pyrrhotite).

Synonyms:

fool"s gold, iron pyrite, mineral, atomic number 34, selenium, Se,

Antonyms:

organic,