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 is a common mineral made of iron and sulfur (with the chemical formula FeS2) that is sometimes mistaken for gold because of its metallic shine, earning it the nickname "Fool's Gold." It is the most abundant sulfide mineral found in the Earth's crust, making it geologically significant and useful in various industrial applications.
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{{Infobox mineral | name = Pyrite | category = Sulfide mineral | boxbgcolor = | image = Pyrite - Huanzala mine, Huallanca, Bolognesi, Ancash, Peru.jpg | imagesize = 260px | caption = Intergrowth of lustrous, cubic crystals of pyrite, with some surfaces showing characteristic striations, from Huanzala mine, Ancash, Peru. Specimen size: 7.0 × 5.0 × 2.5 cm | formula = FeS2 | IMAsymbol = Py | molweight = 119.98 g/mol | strunz = 2.EB.05a | dana = 2.12.1.1 | system = Cubic | class = Diploidal (m) H-M symbol: (2/m ) | symmetry = Pa | unit cell = a = 5.417 Å, Z = 4 | color = Pale brass-yellow reflective; tarnishes darker and iridescent | habit = Cubic, faces may be striated, but also frequently octahedral and pyritohedral. Often inter-grown, massive, radiated, granular, globular, and stalactitic. | twinning = Penetration and contact twinning | cleavage = Indistinct on {001}; partings on {011} and {111} | fracture = Very uneven, sometimes conchoidal | tenacity = Brittle | mohs = 6–6.5 | luster = Metallic, glistening | refractive = | opticalprop = | birefringence = | pleochroism = | streak = Greenish-black to brownish-black | gravity = 4.95–5.10 | density = | melt = | fusibility = 2.5–3 to a magnetic globule | diagnostic = | solubility = Insoluble in water | diaphaneity = Opaque | other = Diamagnetic to paramagnetic A semiconductor with bandgap of 0.72 to 3.26 eV. | references = }}
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.
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