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Mineralpedia Details for Pyrite

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Pyrite

Pyrite

Named for the Greek word for “fire,” pyr, as sparks can be produced from striking it. Pyrite is the most widespread and abundant sulfide in the world and van be found in tens of thousands of localities with large and/or fine crystal being produced from Italy on Elba and at Piedmont, in Spain, Kazakhstan, in the United States from Colorado, Illinois, Arizona, Pennsylvania, Vermont, Montana, Washington, and Missouri, and also in Peru. Pyrite forms in hydrothermal veins, in magmatic segregations, as an accessory mineral, in pegmatites, contact metamorphosed deposits and metamorphic rocks, and in sedimentary rocks as a diagenetic replacement mineral. Pyrite is paramagnetic, magnetic in the presence of applied magnetic fields, and can be used as a semiconductor.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pyrite.pdf

Formula
FeS2 
Crystal System
Isometric 
Crystal Habit
Striated, Druse, Stalactitic 
Cleavage
Poor, Poor, None 
Luster
Metallic 
Color
pale brass yellow 
Streak
greenish black 
Class
Isometric - Diploidal 
Fracture
Conchoidal 
Hardness
6.5 
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Pyrite from Nanisivik mine, Baffin Island, Nunavut Territory, Canada

Pyrite
            from Nanisivik mine, Baffin Island, Nunavut Territory, Canada

Pyrite with striated cubes to 1.5cm.

Great example of modified cubic Pyrite crystal to 1cm on Pyrite matrix.

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Pyrite from Buick mine, Reynolds Co., Missouri, United States

Pyrite
            from Buick mine, Reynolds Co., Missouri, United States

Brassy cubic crystals in aggregates resembling balls to 5mm in a large pocket on white Dolomite.

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Pyrite from Butte dist., Silver Bow Co., Montana, United States

Pyrite
            from Butte dist., Silver Bow Co., Montana, United States
Special Info
Phillips Collection

Superb specimen with brassy golden Pyritohedrons to 5mm laced nicely with stacks of thin platy, pseudo-hexagonal, twinned crystals of Chalcocite crystals to 2mm across. There are also some creamy colored unknown crystals in thin platy rosettes. The last photo shows the Dickite.

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Pyrite from Thomaston Dam RR cut, Litchfield Co., Connecticut, United States

Pyrite
            from Thomaston Dam RR cut, Litchfield Co., Connecticut, United States

A locality specimen with tiny Pyrite crystal, one in particular showing elongated cubic development into a rod. Other minerals in the matrix include purple and blue Fluorite and Galena.

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Pyrite from Orman Dam, Belle Fourche, Butte Co., South Dakota, United States

Pyrite
            from Orman Dam, Belle Fourche, Butte Co., South Dakota, United States

Coppery colored clustered Pyrite crystals.

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Pyrite from C. E. Duff & Son quarry, Huntsville, Logan Co., Ohio, United States

Pyrite
            from C. E. Duff & Son quarry, Huntsville, Logan Co., Ohio, United States

Hundreds of complex Pyrite crystals from 1 to 4mm lining limestone vug.

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Pyrite from Casapalca, Lima Dept., Peru

Pyrite
            from Casapalca, Lima Dept., Peru

Large pyritohedron to 2cm with micro white Calcite and deep red sphalerite.

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Pyrite from Julcani mine, Julcani dist., Huancavelica dept., Peru

Pyrite
            from Julcani mine, Julcani dist., Huancavelica dept., Peru

Botryoidal Pyrite with balls to 5mm.

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Pyrite from West Fork mine, Reynolds Co., Missouri, United States

Pyrite
            from West Fork mine, Reynolds Co., Missouri, United States

A single Galena crystal 1.4cm showing octahedral forms surrounded by golden Pyrite cubes to 4mm.

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Pyrite from Sparta, Randolph Co., Illinois, United States

Pyrite
            from Sparta, Randolph Co., Illinois, United States

This is what has always been called a Pyrite "sun", which is formed in black shales between and parallel to the thin layers resulting in these pancake like aggregates of Pyrite. Those cracks you see are perfectly stable and are rehealed.

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Pyrite from Camp Bird mine, Ouray Co., Colorado, United States

Pyrite
            from Camp Bird mine, Ouray Co., Colorado, United States

A fine cluster of nicely striated, modified cubic, Pyrite crystals from 4 to 10mm. Each crystal is so well-defined you will have fun turning this specimen in your hand while marveling at each crystal.

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Pyrite from Remedios mine, Taxco, Guerrero, Mexico

Pyrite
            from Remedios mine, Taxco, Guerrero, Mexico

Hundreds of 1-3mm octahedral and iridescent Pyrite crystals on Quartz. Ex. Al Mura collection.

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Pyrite from Morenci mine, Greenlee Co., Arizona, United States

Pyrite
            from Morenci mine, Greenlee Co., Arizona, United States

A fabulous Pyrite crystals with cubic forms and many overgrowtch nestled in Quartz needles. The Pyrite crystal is 1.6cm.

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