mineral
Rainbow Pyrite
Iron Sulfide (FeS2) with iridescent oxidation
AI-generated identification · may be incorrectHardness: 6-6.5 on the Mohs scale, Color: Iridescent rainbow colors (blues, purples, golds, greens), Luster: Metallic, Crystal Structure: Isometric (cubic), Specific Gravity: 4.8-5.0
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 on the Mohs scale, Color: Iridescent rainbow colors (blues, purples, golds, greens), Luster: Metallic, Crystal Structure: Isometric (cubic), Specific Gravity: 4.8-5.0
Formation & geological history
Formed in sedimentary environments where pyrite nodules undergo surface oxidation and thin-film interference, creating the rainbow play of colors.
Uses & applications
Popular as a collector's specimen, in jewelry making, and for ornamental display due to its striking natural iridescence.
Geological facts
The vibrant colors are caused by a natural thin film of iron oxide or hydroxide on the surface of the pyrite, similar to an oil slick on water.
Field identification & locations
Most famously found in the Ural Mountains of Russia. Easily identified in the field by its metallic weight, cubic crystal habits, and brilliant rainbow tarnish.
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