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Mexico | |
| [var. Illite] Simmons, S. F., White, N. C., & John, D. A. (2005). Geological characteristics of epithermal precious and base metal deposits. Economic Geology 100th anniversary volume, 29, 485-522. |
| Panczner, William D. (1987) Minerals of Mexico. Van Nostrand Reinhold Company Inc., New York. |
| [var. Sericite] Smith, Robert L., Simons, Frank S., Vlisidis, Angelina C. (1953) Hidalgoite, a new mineral. American Mineralogist, 38 (11-12) 1218-1224 |