mineral
Rainbow Pyrite
Iron Sulfide (FeS2) with iridescent oxidation
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
- Hardness
- 6-6
Identified More mineral →
Explore Rainbow Pyrite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral