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USA | |
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| Econ Geol (1985) 80:1425-1435 |
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| Stevens, L., E. Ito & D. Olson (2000) Relationship of Mn-carbonates in varved lake sediment to catchment vegetation in Big Watab Lake, MN, USA :Journal of Paleolimnology: 24 (2): 199β211. |
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| Mike Hedtke (2000) Mineral News, 16, #4, 1-7.
Mike Hedtke (2000) Mineral News, 16, #4, 1-7. |
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| Mike Hedtke (2000) Mineral News, 16, #4, 1-7. |
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| Gruner, John W. (1947) Groutite, HMnO2, a new mineral of the diaspore-goethite group. American Mineralogist, 32 (11-12) 654-659 |
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| USGS Prof Paper 407 |
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| McSwiggen, P. L., Morey, G. B., & Cleland, J. M. (1994). Occurrence and genetic implications of hyalophane in manganese-rich iron-formation, Cuyuna Iron Range, Minnesota, USA. Mineralogical Magazine, 58(392), 387-400. |
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| Econ Geology (1993)88:104-122 |
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| Heyl, A. & W. West (1982) Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa and Minnesota: Economic Geology: 77 (8): 1803-1817. |
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| Frank C. Schrader.,Ralph W. Stone and Samuel Sanford (1917) Useful Minerals of the United States
USGS Bulletin 624 |
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| William S. Cordua collection |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Yalmer Primeau collection |
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| Lee, I., Ripley, E.M. (1995) Canadian Mineralogist, 33, 723-743. |
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| Bill Morgenstern - collected location |
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| Bill Morgenstern. |
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| Bill Morgenstern - Personal Collection |
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| Ojakangas, R. W. and Matsch, C. L. (1982): Minnesota's Geology.U of Minnesota Press. 255p. |
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| Green, J. C. (1987). Plateau basalts of the Keweenawan North Shore Volcanic Group. Geol. Soc. Am. Centennial Field GuideβNorth-Central Section, 59-62. |
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| Winchell, N. H. (1883), The Geological and Natural History Survey of Minnesota, The 11th Annual Report. For the year 1882
131-132. |
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| Econ Geol (1985) 80:1425-1435 |
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| Boerboom, T. L. (2014) Characterization of the Franklin peridotite and other similar intrusions in east-central and southwestern Minnesota: Minnesota Geological Survey Report of Investigations 70, 20 p. |
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| In personal collection - Bill Morgenstern |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Frank Karasti |
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| Green, J. C. (1987). Plateau basalts of the Keweenawan North Shore Volcanic Group. Geol. Soc. Am. Centennial Field GuideβNorth-Central Section, 59-62. |
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| Edith Trybalski |
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| Econ Geol (1993) 88:679-696 |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Allan Blaske collection, identified by physical properties (hardness, crystal form, cleavage) |
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| ArcelorMittal |
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| Rocks & Minerals 81:136-140 |
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| Frank Karasti |
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| R. Peter Richards Collection |
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| 55TH INSTITUTE ON LAKE SUPERIOR GEOLOGY (2009) PROCEEDINGS VOLUME 55 p. 70-71 |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| ArcelorMittal |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Frank Karasti |
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| Machamer, J. F. (1964). Geology and Origin of the Iron Ore Deposits of the Zenith Mine, Ely, Minnesota. PhD Thesis The Pennsylvania State University. |
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| Frey, B., & Hanson, A. (2008) Drill Core Evaluation of Vermilion Greenstone Belt Gold Mineralization, Northeastern Minnesota. DNR Open-File Project 373: 2008-2010 |
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| Frey, B., & Hanson, A. (2008) Drill Core Evaluation of Vermilion Greenstone Belt Gold Mineralization, Northeastern Minnesota. DNR Open-File Project 373: 2008-2010 |
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| Frey, B., & Hanson, A. (2008) Drill Core Evaluation of Vermilion Greenstone Belt Gold Mineralization, Northeastern Minnesota. DNR Open-File Project 373: 2008-2010 |
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| Frank Karasti |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Journal of Paleolimnology 24: 199β211, 2000. |
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| Heyl, A. & W. West (1982) Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa and Minnesota: Economic Geology: 77 (8): 1803-1817. |
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| Heyl, A. & W. West (1982) Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa and Minnesota: Economic Geology: 77 (8): 1803-1817. |
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| William S. Cordua |
Highway 61 roadcuts, Illgen City, Lake County, Minnesota, USA