Where is the biggest smoky quartz mine?

The largest smoky quartz mine is located in the Minas Gerais region of Brazil, specifically in the town of Governador Valadares. This area is renowned for its rich deposits of quartz crystals, including smoky quartz, which is highly prized for its aesthetic qualities and use in jewelry. The mine produces significant quantities of high-quality smoky quartz, contributing to its prominence in the gemstone market.