pyrites - définition. Qu'est-ce que pyrites
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Qu'est-ce (qui) est pyrites - définition

IRON (II) DISULFIDE MINERAL
Iron pyrite; Pyrites; Fool's Gold; Iron pyrites; Fool's gold; Fools gold; Iron Pyrite; Fool’s Gold; Fools' gold; Bravoite; Auriferous; Alpina diamond; Fools' Gold; FeS₂
  • disp=sqbr}} on edge)
  • A pyrite cube (center) has dissolved away from a host rock, leaving behind trace gold
  • [[Pyritohedron]]-shaped crystals from Italy
  • Pyrite under normal and polarized light
  • An abandoned pyrite mine near [[Pernek]] in [[Slovakia]]

pyrites         
[p??'r??ti:z]
(also iron pyrites; Mineralogy pyrite)
¦ noun a shiny yellow mineral consisting of iron disulphide, occurring as intersecting cubic crystals.
Derivatives
pyritic adjective
pyritize or pyritise verb
Origin
ME (denoting a mineral used for kindling fire): via L. from Gk purites 'of fire', from pur 'fire'.
Pyrites         
·pl of Pyrite.
II. Pyrites ·noun A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color.
Pyrite         
·noun A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide.

Wikipédia

Pyrite

The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral.

Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.

The name pyrite is derived from the Greek πυρίτης λίθος (pyritēs lithos), 'stone or mineral which strikes fire', in turn from πῦρ (pyr), 'fire'. In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel; Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite.

By Georgius Agricola's time, c. 1550, the term had become a generic term for all of the sulfide minerals.

Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds and as a replacement mineral in fossils, but has also been identified in the sclerites of scaly-foot gastropods. Despite being nicknamed "fool's gold", pyrite is sometimes found in association with small quantities of gold. A substantial proportion of the gold is "invisible gold" incorporated into the pyrite (see Carlin-type gold deposit). It has been suggested that the presence of both gold and arsenic is a case of coupled substitution but as of 1997 the chemical state of the gold remained controversial.