Chalcedony from Cloverdale, West Mayacmas Mining District, Sonoma County, California, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Econ Geol (1997) 92:20-28 Quicksilver resources of California: with a section on metallurgy and ore ... By Walter Wadsworth Bradley (1917) |