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USA | |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 297. Bradley, W.W., et al (1918), Manganese and chromium in California: California Mining Bureau. Bulletin 76: 34, 35 |
- Palo Verde Mining District
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (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: 1298. Anonymous (1950), New products: Mineral Notes & News No. 158: 1-18 |