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| F. Rutley: "Elements of Mineralogy", 12th Ed. (1900) |
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| F. Rutley: "Elements of Mineralogy", 12th Ed. (1900)
USGS: Geological Survey Circular 553 |
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| Harder, E.C. (1910) Manganese deposits of the United States, with sections on foreign deposits, chemistry, and uses. United States Geological Survey, Bulletin 427: 298 pgs. |
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| USGS: Geological Survey Circular 553 |
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| USGS: Geological Survey Circular 553 |
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| R. A. F. Penrose, Jr., Annual Report of the Geological Survey of Arkansas for 1890 Volume 1, Manganese: Its USes, Ores, and Deposits |
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| Van Dommelen, Ronnie, Collett, Terry (2006) An Introduction to Minerals in Nova Scotia and a Report on Recent Collecting. Rocks & Minerals, 81 (1) 54-61 doi:10.3200/rmin.81.1.54-61 |
Walton, Hants Co., Nova Scotia, Canada