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USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. California Division of Mines and Geology (1981), Mines & Mineral Producers Active in California during 1980, Special Publication 58 |
| Butler, 1995. Rockhounding California, p.158. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
- Grass Valley Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282. |
| Rocks & Min.: 17:412. |
- Lassen Volcanic National Park
| Robert G. Lee, John H. Dilles, David A. John, Tanya L. Abela (2005) The mineralogy and origin of hydrothermally altered Quaternary volcanic rocks on the south flank of Lassen volcano, California: Interim report for USGS Mineral Resource External Research Program grant of $42,000 in FY 2005 |
- Alleghany Mining District (Forest Mining District)
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
- Steamboat Springs Mining District
| Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology |
| [Opal-A var. Opal-AN] Luetcke, Rolf (n.d.) Personal communication. |
| NBMG Bull 70 Geology and Mineral Resources of Washoe and Storey Counties, Nevada |
Steamboat Hot Springs, Steamboat Springs Mining District, Washoe County, Nevada, USA