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USA | |
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| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
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| Rocks and Minerals ,Sep-Oct,2004 |
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| Ross, Henderson, and Posnjak (1931), American Mineralogist: 16: 213.
Rocks & Min.:11:77
16:290 & 60:92. |
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| [var. Pitchblende] Stern,T.W (1950) A Catalog Of Study Material Of Radioactive Minerals
Trace Elements Investigations Report 129 |
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| |
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| Rocks and Minerals, Sep-Oct,2004 |
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| Logan Babcock |
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| Smithsonian Institution Mineral Reference Collection No.R13650-00,R13658-00,R13653-00, and R13655-00 |
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| Rocks and Minerals,Sep-Oct,2004 |
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| www.excaliburmineral.com
Smithsonian Institution Mineral Reference Collection No.171372-00 |
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| Rocks & Min.: 11:76. |
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| C.W. Allen collection
Rocks & Min.:60:99.
American Mineralogist, Volume 82, pages 607–619, 1997 |
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| Rocks and Minerals (1985) 60:84-93,99
Smithsonian Institution Mineral Reference Collection No.C5584-00 |
Chestnut Flats Mine, Spruce Pine, Mitchell County, North Carolina, USA