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.
Gratonite Market Value Calculator
Estimate the market value of Gratonite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Gratonite Localities Map
See where Gratonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
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© Robert M. Lavinsky
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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