Gratonite
A variety of Minerals
What is Gratonite?
Gratonite is a lead-arsenic sulfosalt mineral, with the chemical composition Pb9As4S15. Gratonite was discovered in 1939 at the Excelsior Mine, Cerro de Pasco, Peru. It is named in honor of geologist L. C. Graton (1880–1970), who had a long-standing association with the Cerro de Pasco mines.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Gratonite 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.
Gratonite Localities Map
See where Gratonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Dark lead-gray
- Hardness (Mohs)
- 2.5
- Density
- 6.17 g/cm³
- Streak
- Black
Chemical Properties
- Chemical Formula
- Pb9As4S15
- Elements
- As, Pb, S
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Gratonite FAQs
How do I identify Gratonite?
Gratonite can be identified by its hardness of 2.5 on the Mohs scale, Dark lead-gray color. Look for these key characteristics when examining specimens.
What color is Gratonite?
Gratonite typically appears in Dark lead-gray. Color can vary depending on impurities and formation conditions.
How hard is Gratonite?
Gratonite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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