Amethyst

Charcas is one of the mining towns of San Luis Potosí, with mining dating back to the late 1500s. Silver mining played a major role in the town's development, and the district remained active for centuries.

Amethyst from Charcas is an interesting collector locality because it comes from this long-established Mexican mining district. The surrounding mines have produced a wide variety of quartz and silver-associated minerals over the years.