Pyrite - Wikipedia, the free encyclopedia


** Pyrite **

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"Fool's Gold" redirects here. For other uses, see Fool's Gold
This article is about iron pyrite. For other pyrite minerals, see Pyrite

2780M-pyrite1.jpgPyrite cubic crystals on marl from Navajún, La Rioja,
Spain (size: 95 by 78 millimetres (3.7 by 3.1 in), 512 grams (18.1 oz);
main crystal: 31 millimetres (1.2 in) on edge)
Category Sulfide mineral
(repeating unit) FeS[2]
Strunz classification 02.EB.05a
Dana classification
Crystal symmetry Isometric diploidal
Space group: Pa3
H-M symbol: 2/m3
Unit cell a = 5.417 Å, Z=4
Formula mass 119.98 g/mol
Color Pale brass-yellow reflective; tarnishes darker and iridescent
Crystal habit Cubic, faces may be striated, but also frequently octahedral
and pyritohedron. Often inter-grown, massive, radiated, granular, globular,
and stalactitic.
Crystal system Isometric
Twinning Penetration and contact twinning
Cleavage Indistinct on {001}; partings on {011} and {111}
Fracture Very uneven, sometimes conchoidal
Tenacity Brittle
Mohs scale hardness 6–6.5
Luster Metallic, glistening
Streak Greenish-black to brownish-black
Diaphaneity Opaque
Specific gravity 4.95–5.10
Density 4.8–5 g/cm^3
Fusibility 2.5–3 to a magnetic globule
Solubility Insoluble in water
Other characteristics paramagnetic
References ^[1]^[2]^[3]^[4]

The mineral *pyrite*, or *iron pyrite*, also known as *fool's gold*, is an
iron sulfide with the chemical formula FeS[2]. This mineral'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.^[5]^[6]

Pyrite is the most common of the sulfide minerals. The name pyrite is
derived from the Greek πυρίτης (/pyritēs/), "of
fire" or "in fire"


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