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Bolivia | |
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| [var. Amethyst] Alfredo Petrov, field trip observations, 2005. |
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| [var. Amethyst] Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009) |
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| Wilson, Wendell E. (2001) Notes From the Editors - Old Yuma mine. The Mineralogical Record, 32 (6) 426-501 |
- Gallofa mine (Socavon Progreso)
| Arch. Mineral. Warsaw, vol. 12, pp.90-95, 1936 |
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| Dunn, P. J., Peacor, D. R., Sturman, B. D. (1978) Mandarinoite, a new ferric-iron selenite from Bolivia. The Canadian Mineralogist, 16 (4) 605-609 |
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| [var. Chalcedony] Federico Ahlfeld and Jorge Muñoz Reyes (1955) Las Especies Minerales de Bolivia. (Banco Minero de Bolivia, 180 pp) |
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| [var. Chalcedony] Min Rec (1977) 8:52-57 |
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| Dr. Fritz Berndt, unpublished analyses |
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| Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia. (Ministerio de Minas y Petroleo, La Paz) |
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| Ahlfeld, F. & Schneider-Scherbina, A. (1964) Los Yacimientos Minerales y de Hidrocarburos de Bolivia. |
Bombori, Chayanta Province, Potosí, Bolivia