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USA | |
| Arizona Department of Mineral Resources (ADMR) Amethyst file. |
| Celestian, Stan (n.d.) MSA FIELD TRIP: BLUE CUBE, PRISM & SPECTRUM MINES. https://www.msaaz.org/event-4187181 |
| Betts, John (n.d.) John Betts website listing. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 346 Lowell, J. & T. Rybicki (1976), Mineralization of the Four Peaks amethyst deposit, Maricopa Co., AZ, Min.Rec.: 7: 72-77. |
| Petrov, Alfredo (n.d.) Personal Communication. |
| Celestian, Stan (n.d.) MSA FIELD TRIP: BLUE CUBE, PRISM & SPECTRUM MINES. https://www.msaaz.org/event-4187181 |
| Celestian, Stan (n.d.) MSA FIELD TRIP: BLUE CUBE, PRISM & SPECTRUM MINES. https://www.msaaz.org/event-4187181 |
Four Peaks Amethyst Mine, Four Peaks, Maricopa County, Arizona, USA