Pyrite (Fool's Gold)

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Chemical composition -- Iron sulfide crystallized in the isometric (cubic) system. Often confused with marcasite, an orthorhombic form of iron sulfide..

Color -- Brassy yellow. Sometimes shows an iridescent tarnish due to oxidation.

Optics -- Opaque, metallic luster.

Durability -- Hardness 6-6.5.

Crystal structure -- Isometric (cubic).

Specific Gravity -- 5.0.

Sources -- Numerous sources throughout the world. Sometimes used in inexpensive jewelry, often as faceted rose cuts.

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