pyrite


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pyrite

(pī`rīt) or

iron pyrites

(pīrī`tēz, pə–, pī`rīts), pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of cubes and pyritohedrons) but is also found in massive, granular, and stalactite form. In spite of its nickname, "fool's gold," it often is associated with true gold; auriferous pyrite is a commercially important source of gold. Other metals that sometimes replace a part of the iron are cobalt, nickel, arsenic, and copper. The most common sulfide mineral, pyrite is widely distributed in rocks of all ages and types. Its chief use is as a source of sulfur in the manufacture of sulfuric acid. The term pyrites is applied to any of a number of metallic sulfides that strike fire with steel. Some minerals resembling pyrite in appearance or composition are arsenopyritearsenopyrite
or mispickel
, silver-white to steel-gray mineral with the metallic luster characteristic of a pyrite. It is a sulfarsenide of iron, FeAsS, crystallizing in the orthorhombic system and occurring also in massive form.
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, chalcopyritechalcopyrite
or copper pyrites
, brass-yellow mineral, sometimes with an iridescent tarnish. It is a sulfide of copper and iron, CuFeS2 . It crystallizes in the tetragonal system but is usually found in the massive form.
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 (copper pyrites), cobaltitecobaltite
, opaque, silver-white, sometimes reddish or grayish mineral of the pyrite group, a compound of cobalt, arsenic, and sulfur, CoAsS. It occurs in crystals of the cubic system, also in compact to granular masses.
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, marcasitemarcasite
or white iron pyrites,
a mineral closely resembling and having the same chemical composition (FeS2) as pyrite. It differs from pyrite in that it is paler in color, becomes darker upon oxidation, and crystallizes in the orthorhombic system.
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 (white iron pyrites or spear pyrites), and pyrrhotitepyrrhotite
or magnetic pyrites,
bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic.
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 (magnetic pyrites).

Pyrite

 

(also iron pyrite), a mineral with the chemical composition FeS2, containing 46.6 percent iron and 53.4 percent sulfur. Admixtures of Co, Ni, As, Cu, Au, and Se are common. The crystal structure is of the NaCl type, in which Fe occupies the position of Na, and the dumbbell-like S22- pair, that of CI. Pyrite crystallizes in the isometric system, forming cubic, pyri-tohedral, and, less often, octahedral crystals. Most often it is massive or granular. It has a pale brass-yellow color and a metallic luster. Its hardness on Mohs’ scale is 6–6.5, and the density ranges from 4,900 to 5,200 kg/m3.

Pyrite is most widely distributed in hydrothermal deposits and in pyrite veins, in which large amounts of the mineral are concentrated. It serves as the raw material for the production of sulfuric acid, sulfur, and copperas (ferrous sulfate). Pyrite deposits in the USSR are found in the Ural Mountains (Degtiarka and Kalata deposits), the Altai, Kazakhstan, and Transcaucasia. Deposits are also found in Norway, Spain (Rio Tinto), Italy, Cyprus, USA, Canada, and Japan.

pyrite

[′pī‚rīt]
(mineralogy)
FeS2 A hard, brittle, brass-yellow mineral with metallic luster, crystallizing in the isometric system; hardness is 6-6.5 on Mohs scale, and specific gravity is 5.02. Also known as common pyrite; fool's gold; iron pyrites; mundic.

pyrite

a yellow mineral, found in igneous and metamorphic rocks and in veins. It is a source of sulphur and is used in the manufacture of sulphuric acid. Composition: iron sulphide. Formula: FeS2. Crystal structure: cubic
References in periodicals archive ?
6 m the drill hole intersected a fault zone which contains semi-massive pyrite chalcopyrite-chalcocite mineralisation from 69.
For me, the truly surprising result is that pyrite weathering and burial appear to be such important processes in the sulfur cycle throughout all of Earth's history.
granular pyrite and clay-gypsum veinlets before ending in unaltered
Hence, if the flux of oxygen consumption by pyrite oxidation is known then the rate of acid production can be estimated.
A note on prospecting of Amjhore pyrite, Rohtas district, Bihar with discussion on the origin of the deposits, Ind Minerals 31:8-22.
In historical times, the wood-on-wood technique was much more widely used than the pyrite method.
Pyrite is extremely responsive to signals, but just isn't as fast as the other dogs, Carlson said.
When they realise it was Phil Hogan who was behind the Government's Pyrite Remediation Scheme they will readily understand why it is a complete and utter failure.
THOUSANDS of broke families are being forced to fork out up to [euro]3,000 to prove their homes are riddled with destructive pyrite, the Irish Sunday Mirror can reveal.
Tenders are invited for the housing and sustainable communities agency (housing agency), is empowered, under the terms of a pyrite resolution act 2013, at the direction of the pyrite resolution board (prb), to engage consultants, advisors, contractors or other bodies it considers necessary to carry out the remediation of dwellings identified as qualifying for remediation by the prb.
Dundee Precious Metals is to sell to China's Xiangguang Copper Co up to 200,000 tons of pyrite concentrate per year to, to be produced in Bulgaria, the company announced.