Home > Lead Minerals – December 10 > MS1456 Gratonite
Gratonite - Sold
- Excelsior mine
- Cerro de Pasco
- Pasco Department
- Peru
- 1.5 by 1.4 by 1.2 cm – Thumbnail specimen (fits into a 2.5 cm cube)
Gratonite is a lead arsenic sulfide originally described from Cerro Pasco. Palache and Fischer (1940) described the mineral. The name honors L. C. Graton, professor of mining at Harvard, and consultant at Cerro de Pasco.
Gratonite here forms steel gray prismatic crystals to 6 mm, in a radiating spherical aggregate. Some of the crystals are broken, as is typical of these. Seldom available and large crystal size.
