Pyrite from Sunnyside Mine group, Bonita Peak, Gladstone, Eureka Mining District, San Juan County, Colorado, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Ransome, Frederick Leslie (1901) A report on the economic geology of the Silverton quadrangle, Colorado. USGS Bull 182 Rocks & Min.: 63: 366-384. |
In Collection of Martin Slama |
Sunnyside Mine group, Bonita Peak, Gladstone, Eureka Mining District, San Juan County, Colorado, USA