Rhodochrosite and Quartz

Emma was the largest manganese mine in Butte, and the most significant producer of rhodochrosite in the state. The mine has since been completely reclaimed and is now a small grassy area. Manganese was extracted from 1934-1957. This spectacular plate featured pink distorted rhombohedra to 1.5cm and is capped by a quartz overgrowth. Some additional deposition of rhodochrosite formed on the complete faces of the quartz. Ex Jim and Paula Wilson.

Locality: Emma Mine, Butte, Montana

Composition: manganese carbonate