Minerals

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General Information

Pyrite

Pyrite has a gold shine and used to be mistaken for gold. It is also known as 'fools gold'. Pyrite has the same chemical composition as marcasite, but with different properties and chemical structure.[1]

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Chemical & Physical Information

Trivial NamePyrite
Chemical NameIron Disulfide
Chemical FormulaFeS2
Density5.01 g·cm-3
Molar mass119.97 g·mol-1
Hardness6-6,5
Crytal systemCubic
Unit cell541,75 pm
Crystal habitPyritohedron
FractureOneven, conchoidal and even.
CleavageBad [110] & [100]
ColourShining Yellow
LusterMetal
StreakBlack Green
OpacityOpaque
SafetySafe
ExtraDissolves in HNO3, not in HCl.
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Photos

Pyrite

(2 cm)

Pyrite

(8 cm)

Pyrite

(4 cm)

Pyrite

(3 cm)

Pyrite

(1 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.