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USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 332 Pampeyan, Earl Haig (1963) Geology and mineral deposits of Mount Diablo, Contra Costa County, California. Special Report 80. California Division of Mines & Geology Van Nostrand Reinholt Press: 303. |
| Dunning, Gail E., Hadley, Ted A., Magnasco, John, Christy, Andrew G., Cooper, Joseph F. Jr. (2005) The Clear Creek mine, San Benito County, California: a unique mercury locality. The Mineralogical Record, 36 (4) Tucson. 337-363 |
| Collected by David Shannon in 1983. |
Breen claim, Picacho Peak, San Benito County, California, USA