Pyrite
What is Pyrite?
Pyrite, also known as fool's gold, is an iron sulfide mineral with a metallic luster. It is a common mineral found in a variety of geological settings. Its brassy yellow color and metallic luster give it a superficial resemblance to gold, hence the nickname "fool's gold."
Optical Properties
- Refractive Index
- 2.00 - 2.00
- Birefringence
- None
- Pleochroism
- None
- Optical Character
- Isotropic
- Dispersion
- Moderate
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Pyrite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Where to Find Pyrite
RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find pyrite in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find pyriteAlways check the local rules and get the landowner's permission before you collect.
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Quick Facts
Physical Properties
- Color
- Pale brassy yellow to golden yellow
- Hardness (Mohs)
- 6 - 6.5
- Rock tumbling
- Not recommended
- Density
- 4.90 to 5.20 g/cm³
- Streak
- Greenish black to brownish black
Chemical Properties
- Chemical Formula
- FeS2
- Elements
- Iron, Sulfur
Also Known As
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Pyrite FAQs
How do I identify Pyrite?
Pyrite can be identified by its hardness of 6 - 6.5 on the Mohs scale, Pale brassy yellow to golden yellow color. Look for these key characteristics when examining specimens.
What color is Pyrite?
Pyrite typically appears in Pale brassy yellow to golden yellow. Color can vary depending on impurities and formation conditions.
How hard is Pyrite?
Pyrite has a hardness of 6 - 6.5 on the Mohs scale. This gives it moderate hardness.