Pyrite

Pyrite - sulfur pyrite , iron pyrite - a mineral, iron sulfide. distributed mainly in the form of solid masses, fine-grained aggregates, veinlets, and in sedimentary rocks - nodules and concretions of various shapes. The color on a fresh chip is light brass-yellow to golden-yellow, with time it changes to dark yellow, often with tarnishing, due to the formation of a surface oxide film. Has a metallic luster. It has conductive properties. It often forms pseudomorphs on organic residues. It is unstable on the earth's surface, and over time pyrite crystals collapse, oxidizing to limonite. Main deposits : Russia, Norway, Sweden, France , Germany, Azerbaijan, USA.

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